Question

if n(a) = 10, n(b) = 7 and n(a n b) = 5, what is n(a u b)?

Answer 1

The answer is (a u b)=(10,7,5).
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Answer 2

Answer:

n(A u B) =n(A) +n(B)- n(AnB)

= 10+7-5

n(AuB) =12

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