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If X and Y are two sets such that X ∪ Y ...

If X and Y are two sets such that `X ∪ Y` has 50 elements, X has 28 elements and Y has 32 elements, how many elements does `X ∩ Y` have ?

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The correct Answer is:
`= 10`
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KUMAR PRAKASHAN-SETS-TEXTBOOK ILLUSTRATIONS FOR PRACTICE WORK
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