Question

If n(AUB)=36,n(A)=20,n(B)=18 then n ( AUB)=​

Answer 1

Answer:

I think u asked the wrong question because n(AUB) is already given in the question.

If u are asking n(A∩B) then the answer is given below -

n(AUB) = n(A)+n(B)-n(A∩B)

36 = 20+18-n(A∩B)

36 = 38 - n(A∩B)

36-38 = - n(A∩B)

-2 = -n(A∩B)

n(A∩B)=2

Therefore answer is 2

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