Question

Find the value of n(An B) if n(A) = 9, n(B) = 11, and n(AUB) = 15. n(An B) = (Type a whole number.)

Answer 1

n(A∩B) = 5

Explanation:

given,

n(A) = 9

n(B) = 11

n(A U B) = 15

we need to find n(A∩B) = ?

using formula,

n(A U B) = n(A) + n(B) - n(A∩B)

n(A∩B) = n(A) + n(B) - n(A U B)

n(A∩B) = 9 + 11 - 15

n(A∩B) = 5