If $X$ and $Y$ are two sets such that $X \cup Y$ has $50$ elements, $H$ has $28$ elements and $Y$ has $32$ elements,how many elements does $X \cap Y$ have?

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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How many elements does following set contain?F={y|y is a point of intersection of two parallel lines}

The correct option is B zeroTwo parallel lines never intersect. Hence, F does not contain any element.

How many elements does following set contain?
$F = {y | y$ is a point of intersection of two parallel lines $}$

The correct option is B zero
Two parallel lines never intersect. Hence, F does not contain any element.