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यदि A व B दो ऐसे समुच्चय है की n(A)=20,n...

यदि A व B दो ऐसे समुच्चय है की `n(A)=20,n(B)=25` व `n(AuuB)=40` तब `n(AnnB)` का मान ज्ञात कीजिए।

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