Add any two odd numbers — say 7 + 9, or 13 + 21. What is the answer always?

Class 6Playing with NumbersPlaying with Numbers

AAlways odd
BAlways even
CAlways prime
DAlways a multiple of 3

Step-by-Step Solution

7 + 9 = 16 and 13 + 21 = 34 — both even. Each odd number is one more than an even number, so two of them contribute an extra 1 + 1 = 2, and the total stays even. The trap is expecting odd + odd to stay odd.

Answer: B) Always even

Key idea: Prime vs composite

A whole number greater than 1 is **prime** if it has exactly two factors: 1 and itself. It is **composite** if it has more than two factors. The number 1 is neither prime nor composite (it has only one factor — itself). 2 is the only **even** prime; every other even number is divisible by 2 and so has at least three factors.

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