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If 6 is a factor of a and 21 is a factor of b, is ab a multiple of 70?

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by BTGmoderatorLU » Tue Nov 03, 2020 10:07 am

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Source: Princeton Review

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
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