Question

n (AUB) - 25, n (A) = 25, n(B)= 10 (ANB) =?​

Answer 1

We have this formula -

n(A ∪ B) = n(A) + n(B) - n(A ∩ B)

putting in the values we have -

25 = 25 + 10 - n(A ∩ B)

= > n(A ∩ B) = 35 - 25 = 10