the smallest value of n , for which 2 n + 3 is not a prime number , is
"( 2 ã — 1 + 3 ) = 5 . ( 2 ã — 2 + 3 ) = 7 . ( 2 ã — 3 + 3 ) = 9 . ( 2 ã — 4 + 3 ) = 15 . which is not prime , n = 3,4 . answer : b"
add(2, 2)