# If n(A ∩</s

Given, n(A B) = 5, n(A B) = 35, n(A) = 13

We have, n(A B) = n(A) + n(B) – n(A B)

35 = 13 + n(B) – 5

n(B) = 35 + 5 – 13 = 40 – 13 = 17

So, n(B) = 17

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