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OpenStudy (anonymous):
a website requires a four digit password in which the numbers cannot repeat how many different combinations are there
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OpenStudy (anonymous):
There are 10 digits: 0,1,2,...,8,9 Since you can pick any of the 10 digits for the first digit of the password, no. of choices = 10 For the second digit, since the first digit cannot be repeated, only 9 choices are available. How about for the third and the last digit? How many number of choices?
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