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यदि X और Y दो ऐसे समुच्चय है कि n(X)=1...

यदि X और Y दो ऐसे समुच्चय है कि n(X)=17, n(Y)=23 तथा `n(X cup Y)=38`, तो `(X cap Y)` में कितने अवयव होंगे

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