SETS 4

If n(A)= 85 , n(B)= 96 and n(AuB)= 130, find n(AnB).

Solution

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

130 = 85 + 96 - n(AnB)

130 = 181 - n(AnB)

130 - 181 = - n(AnB)

-51 = -n(AnB)

n(AnB) = 51 [after dividing by -1 both sides]

Hence n(AnB) = 51 answer

TRY THIS………….

If n(A)= 92 , n(B)= 95 and n(AuB)= 137, find n(AnB).