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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