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Difficulty—
If \(6\) is a factor of a and \(21\) is a factor of \(b\), is \(ab\) a multiple of \(70\)?
1) \(a\) is a multiple of \(4\)
2) \(b\) is a multiple of \(15\)
The OA is B
Source: Princeton Review
1) \(a\) is a multiple of \(4\)
2) \(b\) is a multiple of \(15\)
The OA is B
Source: Princeton Review
