Question

n(B) = 40, n(AnB) = 20, n(AUB) = 35, find n(A) *​

Answer 1

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

35 = n(A) + 40 - 20

= n(A) + 20

n(A) = 35 - 20

= 15.

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