Nixondutta wrote:

If n is a prime number, what is the value of n?

(1) n^2 + n = 6.

(2) 4n is a single digit even number

It's given in the question that n is a prime number. we have to find out value of n.

statement 1: n^2 + n = 6

n(n+1)=6

n and n+1 are consecutive number. only n equals to 2 meet the equation true. thus , n = 2 which is a prime.

statement 2: 4n is a single digit even number. It means that 4n< 10 . so n<2.5. only prime below 2.5 is 2 . thus, statement 2 is sufficient.

The correct answer is D.