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Earn +20 ptsQ: Check 4 digit codes 1-9
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How many different 4-digit codes are possible if the last digit has to be zero?
There can be 103 = 1000 codes.
How many different 4-digit codes are possible if the digits cannot be repeated?
If you include 0000, ten thousand unique four digit codes are possible.
How many 3 digit codes can be made from 1 2 3 4 5 without repeating a digit?
this is impossible
How can you check if a number is a multiple of 4?
Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.
How many possible 4 digit 0 thru 9 codes?
If the first digit can be zero, there are 5,040. If the first digit can't be zero, there are only 4,536.
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