Question

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

Solution - n(A) = 15, n( A U B) = 29, n( A ∩ B) = 7

n( A U B ) = ____________________ ( write the formula)

29 = 15 + n(B) - ________

n(B) = 29 – 15 n( B) = _____​

Answer 1

Answer:

it's answer is twenty one

Answer 2

Answer:

n( A U B ) = n( A ) + n( B ) - n( A ∩ B )

.°. 29 = 15 + n( B ) - 7

.°. 29 - 15 + 7 = n( B )

.°. n( B ) = 21