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Division and Multiplication, right?

what does it mean set closed?

It's either A and D or all of them. I'm not sure

Oh wait it can't be division because you can't divide by 0.....

not addition because 1+1 = 2 is not in the set

yes -1 + 1 = 0

right?

0 x -1 = 0
0 x 1 = 0
1 - 1 = 0
So, is it multiplication and subtraction?

Does the table make sense?

So, it's only multiplication that will work?

let's find out by making a multiplication table
|dw:1441669432403:dw|

here's what the addition table would look like
|dw:1441669534485:dw|

And division won't work either, right. Because you can't divide by 0

correct

division table
|dw:1441669624730:dw|

Thanks for the help!!

no problem