Question

n(A) =11, n(B) =7, n(AUB) =13, then find AB=?​

Answer 1

Answer:

Sorry I don't have the answer to your question

Step-by-step explanation:

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Answer 2

Answer:

5

Step-by-step explanation:

what does AB means

I think it should be n(AnB)

in that case

n(AuB)=n(A)+n(B)-n(AnB)

n(AnB)=11+7-13

=5