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

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If \( \mathrm{X} \) and \( \mathrm{Y} \) are two sets such that \( n(\mathrm{X})=17, n(\mathrm{Y})=23 \) and \( n(\mathrm{X} \cup \mathrm{Y})=38 \), find \( n(\mathrm{X} \cap \mathrm{Y}) \).
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