We have to pick a password with six lowercase letters, since there's 26 letters in the english alphabet we can simply multiply:. A password is to consist of six lowercase letters. How many passwords are possible? Statistics Probability Combinations and Permutations. Marvin V. Jul 24, This is assuming you are able to select the same letter multiple times. Related questions At a restaurant, you can choose from 2 appetizers, 4 main courses, and 3 desserts.

How many In general, if you have m items of one type and n things of another type, how many possible You have created a random 5-digit password for your computer. A hacker tries to break in to In how many ways can you arrange 5 books in a bookshelf? How do you calculate permutations on the TI? There are 7 children in a classroom. In how many ways can they line up for recess? What is a combination? What is the difference between combinations and permutations?

There are 9 students in a club.

Three students are to be chosen to be on the entertainment See all questions in Combinations and Permutations. Impact of this question views around the world. You can reuse this answer Creative Commons License.Instructions: To find the answer to a frequently-asked question, simply click on the question.

If none of the questions addresses your need, refer to Stat Trek's tutorial on the rules of counting or visit the Statistics Glossary. Online help is just a mouse click away. A permutation is an arrangement of all or part of a set of objects, with regard to the order of the arrangement. For example, suppose we have a set of three letters: A, B, and C. We might ask how many ways we can arrange 2 letters from that set. Each possible arrangement would be an example of a permutation.

When statisticians refer to permutations, they use a specific terminology. They describe permutations as n distinct objects taken r at a time. Translation: n refers to the number of objects from which the permutation is formed; and r refers to the number of objects used to form the permutation. Consider the example from the previous paragraph. For an example that counts permutations, see Sample Problem 1. A combination is a selection of all or part of a set of objects, without regard to the order in which objects are selected.

We might ask how many ways we can select 2 letters from that set. Each possible selection would be an example of a combination. When statisticians refer to combinations, they use a specific terminology.

They describe combinations as n distinct objects taken r at a time. Translation: n refers to the number of objects from which the combination is formed; and r refers to the number of objects used to form the combination. Note that AB and BA are considered to be one combination, because the order in which objects are selected does not matter.

This is the key distinction between a combination and a permutation.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Information Security Stack Exchange is a question and answer site for information security professionals. It only takes a minute to sign up. I have found a flaw in a site where the password reset feature resets passwords in the following format.

I'm not a cryptographer but this seems like a significant weakness to me. I'd like some data to back that assumption up : Cheers.

## A password is to consist of six lowercase letters. How many passwords are possible?

I would like to mention on top of the other answer s in regards to the weakness of this particular system, a password reset feature is only for temporary passwords. The password could be reset because a user forgot it or has been locked out of the system. Since the user requests that the password reset, with some other form of validation of account ownership like email address, the password should only be active for around 5 minutes or less. If the password reset is implemented securely, it may lock the account after 10 attempts to deter brute force at the time of password reset.

However, this attack is probably unlikely to happen with the small time constraint. If an attacker gets ahold of the encrypted database passwords, then they may be able to bruteforce the table of temporary passwords to try and log in before the user is able to. In this case, having a small password is a weakness but they probably have other weaknesses as well. If you know someone has a 1-digit password, chosen by a common die roll, then you know that there are 6 possible passwords.

You keep multiplying by itself, or raising to a higher exponent, every time you add a digit. If you have a fixed format, you just multiply the possibilities for each position, just like we did with regular passwords.

If the format is something like A0a0a0A, then the options are:. How strong is this? It depends how fast you can crack the password. If you have something like an MD5 hash of the password e. If you do not have the hash, so instead you can only try to log in on a website, then you might get around 10 attempts per second or 2 per second, ordepending on circumstances, but nothing close to a billion. If my password can be 1, 2, 3, 4, 5 or 6, then on average, after 3 guesses you will have guessed correctly.

Same here: if you have million possible passwords and you can do 10 attempts per second, and there are 2 seconds per month, it would take about 9 months on average. In the worst case if you are unlucky and you guess it on the last attemptit would take 1.

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If you get very lucky, you could guess correctly on the first try and crack it in 0. Sign up to join this community. The best answers are voted up and rise to the top. How can i calculate the number of possible passwords? Ask Question. Asked 7 years, 6 months ago. Active 2 years, 5 months ago.Leave us a question or comment on Facebook. Com All Rights Reserved. Password Possible Options Calculator This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to provide the number of possible options for a password of up to X characters long, with a minimum of Y characters required, from a possible pool of Z characters.

The length is the potential of the field; most are 8 characters but you may change as needed. Most passwords are a minimum of 4 characters but our default is zero 0 meaning you don't have to actually have a password. The default character pool is composed of numbers and letters.

If the password is only numbers, the potential character pool is 10 If the password is only letters, the character pool is 26 A-Z upper or lower case accepted as the same.

If upper and lower case are different, the character pool is 52 instead of If the pool is alphanumeric, add 10 to the character pool; each group is additive. Do NOT consider spaces although some systems allow them ; we consider those based on the minimum number of characters required. Enter the values then click on Calculate. The maximum number of password possibilities for the values you entered is returned. If you had forgotten your password and were trying to guess it, and you guessed a different password each try, this is the maximum number of attempts until you guess it correctly.

It does not mean it will actually take you that many tries; however, it could. Since we are dealing in probability, it is probable that the number returned will be larger than you expected and will probably be in scientific notation. Com has an excellent section on learning scientific notation. If you would like to have a password generated for you, please try our Secure Password Creator.

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Does this make sense or should i not count down since it doesn't matter if the characters are different? Learn more. How many passwords are possible [closed] Ask Question. Asked 7 years, 6 months ago. Active 7 years, 6 months ago. Viewed 3k times. What are you trying to figure out? Say the answer is billion. What does that tell you? And what does that help you with? Say there are billion.

What then? Then it would make sense for a attacker to do the attack as long as there isnt an automatic password reset in less time? Active Oldest Votes. Aiias Aiias 4, 1 1 gold badge 15 15 silver badges 31 31 bronze badges.

Unless I'm missing something, you haven't considered the fact that the choices can be permuted. As long as a password meets those requirements shouldn't order not matter?

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Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It only takes a minute to sign up. A certain security system has passwords that consist of 6 characters. The passwords are case sensitive and must satisfy the following requirements:.

### How Many Combinations Can You Make With Six Digits?

First, choose 2 positions to hold the digits. Then, enumerate the possible arrangements of these two digits. Third, do the same with the four positions left for letters. Finally, carefully filter out the schemes where all letters are in uppercase or lowercase.

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Number of possible 6 character passwords Ask Question. Asked 3 days ago. Active 3 days ago.

Viewed 32 times. The passwords are case sensitive and must satisfy the following requirements: Contain 4 letters from 26 letters "a" to "z"repeats are allowed At least one letter must be lowercase At least one letter must be uppercase Contain 2 digits from 10 digits "0" to "9" How many different passwords are possible in this system?

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Related 0. Hot Network Questions. Question feed. Mathematics Stack Exchange works best with JavaScript enabled.Rewarding Customers Who Review So, considering all of the above mentioned sites that you can get customers to share their opinions on, what can you do to encourage them to create these reviews. Google Alerts and Social Mentions Last, but not least, there are likely a ton of customer reviews that are written about your company on other sites, such as personal blogs, that are unsolicited.

Compiling Your Testimonials Page So now that you have collected all of these great reviews, you will want to add them to one page on your website that you can direct potential customers to so they can see what great things you have done for others. How Do You Acquire Customer Testimonials. Related Posts Customer Testimonials: How to Put Your Customers to Work for You 4 Legal Tips for Using Customer Testimonials 3 Unusual Tactics For Making Your Testimonials More Persuasive Customer Engagement Automation Customer engagement requires two components: behavioral analytics and engagement automation.

Learn More Email this content. Get the free iPhone app Measure people, not pageviews. No amount of advertising, tweeting or direct mailing can impact customers the way an objective peer review can.

See also: 5 Tips to Jumpstart Your CreativityWhile online reviews are a precious commodity for any business, soliciting reviews from customers can be a delicate courtship. Here are seven tips to help you overcome the awkwardness and encourage customers to leave reviews. The average customer is not going to search for ways to leave your company a review (unless they have a negative experience to share).

Put direct links to your review profiles in multiple places, for example, a thank you or follow-up email.

Having a presence on every review site (or every review site that makes sense for your business) can make the process more seamless and comfortable for your customers. Ask customers to leave a review on their favorite site never pressure them to write reviews on multiple sites. And be careful about pushing customers to write a review on a brand new site.

You can help your case and foster goodwill by being as candid and open as possible with your customers. We do, and so do other customers. However, I appreciate the fact that anyone writing a review is taking time out of their busy schedule to benefit the overall community. You just need to make sure your offer is for writing a review, not just for writing a good review.

Bombarding customers under the age of 30 with requests to post a review will probably turn them off. However, if you have older or less social media savvy customers, they may need a little more prompting or hand-holding. While a positive review is great for your business, the real value lies in the reviewer. That person took the time to describe and share the great experience they had with your business. Think about how you can further leverage this relationship. For example, you can produce video testimonials from your top customers to post on your website.

Nothing tells a story better than well-produced, sincere video clips from real people. At the end of the day, the best path to having great reviews is to offer a great product and customer experience. Click Here to find out more. Powered by its own proprietary technology, Mashable is the go-to source for tech, digital culture and entertainment content for its dedicated and influential audience around the globe.

Consumers are becoming more review-savvy, preferring businesses that receive high volumes of high-scoring reviews on a regular basis. Consumers are also changing their habits regarding what they do after reading a positive review.

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