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

If X and Y are two sets such that X has 40 elements, `X uuY`has 60 elements and `X nnY`has 10 elements, how many elements does Y have?

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To find the number of elements in set Y, we can use the formula for the union of two sets: \[ |X \cup Y| = |X| + |Y| - |X \cap Y| \] Where: - \( |X| \) is the number of elements in set X. ...
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