What is the result of product of even numbers and odd numbers?

Even x even = even

Odd x odd = odd

Even x odd = even

If you multiply one even number by one odd number, the result is always even.

In general, if you multiply several numbers, and at least one of the numbers is even, the product is always even. This is because "even" means "multiple of 2", and if one of the factors contains a 2 as a factor, so will the product.