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Alice is given the numbers 2,3,5,7, and 9. She must choose a pair of these digits, with the digits being different, to form a two-digit number. How many of the numbers she can construct will be divisible by 3?

 Jul 10, 2020
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Out of a total of: 5 nPr 2 =20 permutations, only these 6 are divisible by 3:

 

27 , 39 , 57 , 72 , 75 , 93 , Total =  6

 Jul 10, 2020

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