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Source: — Data Sufficiency |
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by Jim@StratusPrep » Wed Jan 25, 2012 8:43 pm
I am going to go under the assumption that P is positive here (although is doesn't state it)...

1) excluding 2, all prime numbers are odd so if you add 3 you will get an even number and thus P+3 cannot be prime if it is odd, so P must be 2.

2) Pretty much the same explanation as number 1

Thus the answer would be D

If P can be positive or negative (which would be my interpretation on the "real GMAT"

Use same odd/even logic from above, except this time one you can get an even prime.

1) P could be -1 or 2
2) P could only be 2

Answer would be B
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