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DeMorgan's Law would say that n (~A n ~B) = n ( ~(A U B) ) Let the symbol ~ be used as the "complement of"
we see that n (~ (A U B) ) = n(U) - n(A U B)
n(A U B) = n(A) + n(B) - n(A n B) = 100 + 60 - 30 = 130
n (~ (A U B) ) = n(U) - n(A U B) = 210 - 130 = 80
Therefore n(~A n ~B) = 80
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