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Question
जर n (A) = 15, n (A ∪ B ) = 29, n (A ∩ B) = 7 तर n (B) = किती?
Sum
Solution
n(A) = 15, n(A ∪ B) = 29, n(A ∩ B) = 7
n(B) = n(A ∪ B) + n(A ∩ B) - n(A)
= 29 + 7 - 15
n(B) = 21
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