GMATPrep DS 33

parisfr67 wrote: what is the val for p?
(1) p/4 is PRIME ...
PRIME are 2,3,5,7,11,13,17,19, etc ... having no factor except itself and one .. How can anything be divided by four and be a prime number .. NOT SUFF

I think you're reading 1 incorrectly. Statement 1 is not saying that p is prime but that the expression (p/4) is a PRIME. So for example (28/4) = 7 is prime (i.e. 7) but notice that (12/4) = 3 is a prime too (i.e. 3) . So in this interpretation 1 is INSUFF because (p/4) could equal 7 or 3 depending on p.

(2) p is divisible by 3 ... Many numbers divisible by 3 ... NOT SUFF

TRUE

Together:
p is div by 3 and p/4 is PRIME ... I see a contradiction with the definition of prime numbers ... Hence my answer of E

Correct Answer is C ... Can someone explain to me how p/4 is PRIME given p is divisible by 3

The only value for p where the expression (p/4) is prime AND p is divisible by three is the value of 12, where p = 12.

ANSWER IS C

hope that helps? . . . looks like you just misread statement 1?

regards
Alain