If \( \mathrm{X} \) and \( \mathrm{Y} \) are two sets such that \( \mathrm{X} \cup \mathrm{Y} \)...

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If \( \mathrm{X} \) and \( \mathrm{Y} \) are two sets such that \( \mathrm{X} \cup \mathrm{Y} \) has 50 elements, \( \mathrm{X} \) has 28 elements and \( \mathrm{Y} \) has 32 elements, how many elements does \( \mathrm{X} \cap \mathrm{Y} \) have?
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