Question

If n(A u B)=36,n(A)=20,n(B)=28,n(A n B)=?​

Answer 1

Answer:

36=20+28-n (A n B)

n (A n B)=12

Answer 2

Answer:

WE KNOW THAT

n(A u B) = n(A) + n(B) - n(A n B)

So

36 = 20 + 28 - n(A n B)

So

n(A n B) = 48 - 36 = 12

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