Question

Let X={a, e, i, o, u}and Y={a, g, o, f}. Verify that n(A-B) = n(A) - n(AB)​

Answer 1

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n(AUB)=n(A)+n(B)-n(ANB)_ _ _ _ _ _ _ (1)

given n (A) = 7

n (AUB) = 14

Substituting in 1

14 = 7 + 9 - in (ANB)

=> n (ANB) = 16-14=2

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