Let U = {5, 10, 15, 20, 25, 30, 35, 40}

Question

A = {5, 10, 15, 20}

B = {25, 30, 35, 40}

C = {10, 20, 30, 40}.

Find A ⋂ C.

Answer 1

See answer to previous question.
http://www.jiskha.com/display.cgi?id=1309092028

Here again, A∩C should have two elements.

Answer 2

A n C {10, 20}