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How many 6-digit numbers, formed using each digit from 1 to 6 exactly once, are divisible by 6?

 Jul 9, 2020
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123456. Ones digit must end in 2, 4 or 6. That is 3 choices x 5!(5 x 4 x 3 x 2  x 1) = 360 numbers.

 Jul 9, 2020

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