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กำหนด A = {1, 2, {1}, {1, 2} } แล้ว n(A) = ???
4
A = { 2, 4, 6, 8 } และ B = { 1, 2, 3, 4, 5 } แล้ว n(A U B) = ???
7
A = { 2, 4, 6, 8 } และ B = { 1, 2, 3, 4, 5 } แล้ว n(B - A) = ???
3
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