Question

If n(A)=20, n(B)=28 and n(A ∪ B)=36, then find n(A ∩ B) ​

Answer 1

Answer:

(AΠB) = A + B - (AUB) (formula)

A = 20

B = 28

(A U B) = 36

THEN...USE THE FORMULA :

(AΠB) = 20+28-36 = 48-36 = 12

(A Π B) = 12 HOPE I HELP U

Answer 2

n(A ∪ B) = n(A) + n(B) – n(A ∩ B)

∴ 36 = 20 + 28 – n(A ∩ B)

∴ n(A ∩ B) = 20 + 28 – 36

∴ n(A ∩ B) =12

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