Question

If n(A) = 25, n(B) = 20 and n(A⋂B) = 10, then n(A⋃B) = ? 

a)30

b)45

c)35

d)15

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Answer 1

Answer:

n( A∩B) = n(A) + n(B) - n(A∪B)

10 = 25 + 20 - n(A∪B)

n(A∪B) = 45 - 10

n(A∪B) = 35

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