Question

If n (A)=20, n(B)=28, n (AUB)=36 then n (A ∩ B)=?

Answer 1

Answer: 12

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Step-by-step explanation:

n (AUB)=36

n (A)=20

n(B)=28

n (A ∩ B)=?

We know,

n (AUB)= n (A) +n(B) - n (A ∩ B)

or, 36 = 20 + 28 -   n (A ∩ B)

or,  n (A ∩ B) = 20+28 -36

∴  n (A ∩ B) = 12