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If n(A) = 15, n(A ∪ B) = 29, n(A ∩ B) = 7, then n(B) = ?

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Here, n(A) = 15, n(A ∪ B) = 29, n(A ∩ B) = 7 

n(A ∪ B) = n(A) + n(B) – n(A ∩ B) 

∴ 29 = 15 + n(B) – 7 

∴ 29 – 15 + 7 = n(B) 

∴ n(B) = 21

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