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Probability Level 1

How many of the three digit numbers that can be made from all of the the digits 1, 3 and 5 (used only once each) are prime?

3 1 2 5 0 4

Victor Paes Plinio by Victor Paes Plinio , 21, Brazil

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2 solutions

Sajjad Sajjad
Mar 25, 2015

As, 1 + 3 + 5 = 9 1+3+5=9

However we formed the digits 1, 3 and 5 to make 3-digit numbers. The numbers will be a multiple of 3. So, the answer is 0. :)

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The answer is 0. All permutations of 1, 3 and 5 are multiples of 3.

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