Question

जर n (A) = 15, n (A ∪ B ) = 29, n (A ∩ B) = 7 तर n (B) = किती?

Answer 1

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