What is the number of integers that are common to both set \(S\) and set \(T?\)

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C

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What is the number of integers that are common to both set \(S\) and set \(T?\)

1) The number of integers in \(S\) is \(7,\) and the number of integers in \(T\) is \(6\)
2) \(U\) is the set of integers that are in \(S\) only or in \(T\) only or in both, and the number of integers in \(U\) is \(10\)

The OA is C

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