Given n(U) = 20, n(A) = 12, n(B) = 9, n(...

Given n(U) = 20, n(A) = 12, n(B) = 9, `n(AnnB)` = 4, where U is the universal set, A and B are subsets of U, then `n(AuuB)'` equals.

A

3

B

9

C

11

D

17

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The correct Answer is:

A

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