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Mathematics 7 Online
OpenStudy (anonymous):

At ReallyUnsecurePassword.com, they demand that users have a password of length 4 that uses exactly 2 different digits. How many different passwords can there be

OpenStudy (kropot72):

xyxy xyyx yxyx yxxy

OpenStudy (anonymous):

what is this kropot72 it should be between 0 and 999

OpenStudy (kropot72):

@sagarrobo Are you saying that the answer should be between 0 and 999? If x and y represent the two different digits, then there are 4 possible passwords.

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