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Difference of Two Sets

If X and Y ar...

Question

If X and Y are two sets such that X ∪Y has 18 elements, X has 8 elements and Y has 15 elements; how many elements does X ∩Y have?

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Solution

It is given that:

n(X ∩ Y) = ?

We know that:

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If X and Y are two sets such that X has 40 elements $X \cup Y$ has 60 elements and $X \cap Y$ has 10 elements, how many elements does Y have?

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