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Easy

Question

If $A$ and $B$ are two sets such that $n open parentheses A intersection stack B with minus on top close parentheses equals 9 comma n open parentheses stack A with minus on top intersection B close parentheses equals 10$ and $n open parentheses A union B close parentheses equals 24 comma$ then $n open parentheses A cross times B close parentheses equals$

105
210
70
None of these

The correct answer is: 70

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