Question

If n(A) = 25, n ( AUB) = 39 and n (A ∩ B) = 17 then find n(B)​

Answer 1

Answer:

31

Explanation:

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

39 = 25 + n (B) - 17

39 = 8 + n (B)

n (B) = 31