the smallest value of n, for which 2 n + 1 is not a prime number is
Pick:	A) 3	B) 4	C) 5	D) 6	E) 7
<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<result>B</result>
the smallest value of n, for which 2 n + 1 is not a prime number is
add(2, 2)
"sol . = ( 2 × 1 + 1 ) = 3 , = ( 2 × 3 + 1 ) = 7 , = ( 2 × 4 + 1 ) = 9 , which is not prime . therefore n = 4 . answer b"