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If X and Y are two sets such that X uu Y has 20 objects, X has 10 objects and Y has 15 objects;how many objects does X nn Yhave ? |
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Answer» SOLUTION :GIVEN `|X uu Y |20` `|X|=10 |Y|=15` We KNOW that `|X uu Y| =|X|+|Y|-|X nn Y|` `implies20 =10+15-|X nn Y|` `implies|XnnY|=25-20=5` `:.`X nn Y Has 5 elements. |
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