Bunuel wrote:

If n is an integer, is n + 2 a prime number?

(1) n is a prime number.

(2) n + 1 is not a prime number.

Used variable substitution,

suppose n=3,7

Stmt 1- When n=3 - n is prime ,n+2 is prime .Ans Yes

When n=7 ,n+ 2 is not prime .Ans No

since Yes and No insufficient

Stmt 2:When n=3 ,n+1 is not prime ,n+2 is prime Ans Yes

When n=7,n+1 is not prime ,n+2 is not prime Ans No

So since Yes and No insufficient

Ans E

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Thanks,

Ankit

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