Posted by **Margaret** on Sunday, November 13, 2011 at 11:23am.

Let U = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, A = {10, 12, 14, 16}, B = {13, 17}, and C = {10, 13, 16, 17, 18}. List all the members of each of the sets. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the last boxes.)

A B C with a - over A B.

I came up with {10, 15, NONE.} Is this correct?

- Math Help Please -
**Margaret**, Sunday, November 13, 2011 at 11:29am
that should read A intersection B and union C

- Math Help Please -
**Reiny**, Sunday, November 13, 2011 at 11:39am
A ∩ B = ∅ or the null set

then ∅ ∪ C = C = {10,13,16,17,18}

your answer of {10,15 ,NONE } makes no sense, I don't see an element called NONE

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