If n and r are both odd numbers, which of the following is an even number?

Question: If n and r are both odd numbers, which of the following is an even number? Solution: let, n = 3, r = 5n + r = 3 + 5 = 8 which is an even number.n + r + 1 = 3 + 5 + 1 = 9; odd number nr + 2 = 3 × 5 + 1 = 15 + 2 = 17; odd number nr = 3 × 5= 15; odd number