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by aditya.j » Tue Mar 20, 2012 5:56 pm
If r and s are distinct prime numbers, which of the following CANNOT be evenly divisible by rs?

6
8
10
15
18

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by Jim@StratusPrep » Tue Mar 20, 2012 6:41 pm
It is the only one that does not have at least 2 different prime factors

6 = 2x3
8 = the answer 2x2x2
10 = 3x5
15=3x5
18=2x3x3
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by killer1387 » Tue Mar 20, 2012 6:47 pm
B IMO
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