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Because 7 is not a factor of 15 and 30 (is is though of 35).

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14y ago

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7 is not the greatest common factor (GCF) of 15, 30, and 35 because 7 does not evenly divide into all three numbers. The GCF is the largest number that can divide all three numbers without leaving a remainder, and in this case, the GCF is actually 5 since 5 divides evenly into all three numbers.

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1y ago
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Q: Why is 7 not the GCF of 15 30 and 35?
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