SETS 1

If n(A)= 60 , n(B)= 90 and n(AuB)= 136, find n(AnB).

Solution

n(AuB) = n(A) + n(B) - n(AnB)

136 = 60 + 90 - n(AnB)

136 = 150 - n(AnB)

136 - 150 = - n(AnB)

-14 = -n(AnB)

n(AnB) = 14 [after dividing by -1 both sides]

Hence n(AnB) = 14 answer

TRY THIS………….

If n(A)= 84 , n(B)= 88 and n(AuB)= 135, find n(AnB).