Question

If n is a positive integer, then n3 + 2n is divisible by :

(a) 2

(b) 3

(c) 5

(d) 6

Answer 1

Correct option (b) 3

Explanation:

For n = 1, n3 + 2n = 13 + 2 = 3

which is divisible by 3

∴ n3 + 2n is divisibly by 3 for smallest positive integer.