I agree with Chix47, with a little more detail...

S1. The prime factorization of 36 is

2^2 * 3^2

therefore to be divisible by 36, both N^2 and N must have 3 as a factor

SS2. this statement is written differently from the first. notice that N^2 is in the denominator. Possible values for N^2 are 16, 9, 4. Therefore possible values for N are 4, 3, 2.

4/3 = not an integer

3/3 = an integer

therefore for S2 you get "sometimes yes, sometimes no" and it is insufficient.

Answer: A
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