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Earn +20 ptsQ: How do 25 digit codes work?
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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.
What is the tens digit of the sum of 10 and 15?
10 + 15 = 25. the tens digit of 25 is 2
How many three-digit area codes are possible if the first digit cannot be a 0?
There are 900 possible three-digit numbers not beginning with 0. (Note, however, that this question does not accurately describe the restrictions on numbers that can be used as area codes.)
When did 2 digit zip codes change to 5 digit?
ZIP Code began on July 1, 1963,
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