Bunuel wrote:

If p = (n)(5^x)(3^k), is p divisible by 10?

(1) n, x, and k are even.

(2) x > n > k > 0.

Kudos for a correct solution.

we want n=2^z where z>0 and z = integer; x > 0 and x = integer; k = integer and k>=0

1) assume n=2, x=0, k=0 --> p/10 is not an integer. Assume n=2, x=1, k=0 --> p/10 = int.

Not sufficient

2) x>n>k>0. we don't know whether k, n, and x are integers. Assume k=0,1; n=0,2; x=0,3. Not sufficient.

1+2) variables are integers and are all greater than zero. Sufficient.

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