What is the gratest common factor of 7 15 21?

What is the gratest common factor of 7 15 21?
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Answer :

The GCF is 1.
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Last Answer : A. 15, 19 and 25 degrees

A thermometer measures temperature in whole degrees only. If the temperature falls below 18 degrees, the heating is switched off. It is switched on again when the temperature reaches 21 degrees. What are the best values in degrees to cover all equivalence partitions? A. 15,19 and 25. B. 17,18 and19. C. 18, 20 and22. D. 16, 26 and 32.

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