Math Help Please

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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 ¾ C with a - over A ¿ B.
I came up with {10, 15, NONE.} Is this correct?

  • Math Help Please -

    that should read A intersection B and union C

  • Math Help Please -

    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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