Question

If n(A) = 3x n(B) = 2x n(A intersection B) = n(AUB)' = x find x and n (A-B)

Answer 1

given n(A) = 3 x
given n(B) = 2 x

given n(A ∧ B) = n( A U B)'  = x

n(A - B) = n(A) - n (A ∧ B) = 3x - x = 2 x

I am also doing other answers in case u want.

n(B - A) = n(B) - n(A ∧ B) = 2x - x = x
n (A U B)  = n(A) + n(B) - n (A ∧ B) = 3x + 2x - x = 4 x
U = total universal set = A U B U (AUB)'
n(U) = n(A U B) + n (A U B)' = 4 x + x = 5 x