1 Answered Questions for the topic Factorial,
Factorial, Combinations
04/25/16
A five-digit number is formed by using each of the digits 1, 2, 3, 4, and 5 exactly once. How many five-digit numbers formed this way are divisible by 12?
A hint was given. Use the fact that for a given number to be divisible by 3, it suffices for the sum of its digits to be divisible by 3.
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