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Earn +20 ptsQ: When did 2 digit zip codes change to 5 digit?
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How many 5 digit zip codes are possible?
yes of course I know people with 3 and 2 digit addresses
How many 3 digit codes can be made from 1 2 3 4 5 without repeating a digit?
this is impossible
How many three digit codes can be made using 2 5 7 and 9?
24
How many four digit codes can be formed using the digits 0123456789 if the last digit cannot be 0 or 1 or 2 and repetition of digits is allowed?
If a leading zero is allowed... The first digit can be 0-9, ten possibilities. The second digit can be 0-9, ten possibilities. The third digit can be 0-9, ten possibilities. The fourth digit can be 3-9, 7 possibilities. So there are 10x10x10x7 = 7000 such codes.
Your thousands digit is twice your ones digit your hundreds digit is your ones digit plus 2 your tens digit is the difference between your thousands and hundreds digit what number can you be?
(a)(a-2)(a+2)(2a) It can be: 2044 3156 4268
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