Question

n(A) = 5, N(B) = 9 and n( A Ս B) =21 then n ( A ∩ B) =​

Answer 1

Answer:

7 is the answer of the question

Answer 2

Answer:

n(AUB) = n(A) + n(B) - n(A intersection B)

21 = 5 + 9 - n (A intersection B)

21 - 14 = - n(A intersection B)

- 5 = n(A intersection B)