SOLUTION: If you are allowed to use numbers 1 - 9 and need to choose the passcode of an exact 4 digit code, how many possibilities are there?
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Question 1149391: If you are allowed to use numbers 1 - 9 and need to choose the passcode of an exact 4 digit code, how many possibilities are there?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
If digits can be used more than once, then 9*9*9*9 = 6561.
If digits can't be repeated, then 9*8*7*6 = 3024.
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