PLEASE HELP! 1. Raj was playing around with multiplying odd and even numbers. Here's what he wrote on his paper:

3*5= 15 4*7 = 28 8*5 = 40 6 *4= 24 9*9= 81

Raj conjectured that an even number times an even or odd number will always be even.

Can you give a convincing argument to support his conjecture?​