Question

Can an odd number other than 1 be a factor of an even number​

Answer 1

Here is the logic behind the multiplication rules: an even number is divisible by 2, so that means it has 2 as a factor. ... An odd number is like a bunch of pairs with one left over. So if you add two odd numbers, you have a bunch of pairs and the two lonely units make a final pair, and the sum of two odd numbers is even.

You can bring these properties to mind by testing a couple of possible numbers. A conversation in your head might go like this: “What’s odd times even? Well, 3 times 2 is 6, and that’s even. So, odd times even is always even.” You’re guaranteed to see a question with odd/even rules on the GMAT… so be ready to summon a dialogue like that one into your mind.