If \( X \) and \( Y \) are two sets such that \( X \) has 21 elements, \( Y \) has 32 elements a...

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If \( X \) and \( Y \) are two sets such that \( X \) has 21 elements, \( Y \) has 32 elements and \( X \cap Y \) has 11 elements, how many elements does \( X \cup Y \) have?
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