SOLUTION: if n(A)=7, n(B)=15, and n(A∩B)=5; what is n(AUB)?

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Question 742520: if n(A)=7, n(B)=15, and n(A∩B)=5; what is n(AUB)?
Answer by MathLover1(20850) About Me  (Show Source):
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Consider the formula n%28+AUB%29 = n%28A%29 + n%28+B%29 - n(A ∩ B)
if n(A)=7, n(B)=15, and n(A∩B)=5; what is n(AUB), then
n%28+AUB%29+=+7+%2B+15+-+5
n%28+AUB%29+=+17+