Question

Which set is closed under the operation multiplication? A. {1} B. {1, 2} C. {1, 2, 3} D. {0, 1, 2}

Answer 1

You should multiply all possible combinations, including each element with itself, and see if you get anything outside the set.

Answer 2

It's B, isn't it?

Answer 3

2*2 = 4 and 4 is not in the set.

Seriously, multiply them ALL.

Answer 4

oh, yeah. so A. Don't have to get rude tkhunny

Answer 5

I dare you to show me which part was, without a doubt, rude.
You don't have to take anything as rude. Your choice.