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n(A)={1,2,3,4,7,10,13,15}
n(B)={2,3,5,6,7,11,13}
b).n(AnB)=n{1,2,3,4,7,10,13,15}n{2,3,5,6,7,11,13}
=n{2,3,7,13}
n(AUB)=n{1,2,3,4,7,10,13,15}U{2,3,5,6,7,11,13}
=n{1,2,3,4,5,6,7,10,11,13,15}
maaf bagian c nggak tahu isinya.
yang bagian yang irisannya bukan n tapi dibalikan seperti soal