The common factors are: 1, 2, 3, 6
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hcf(30, 24) = 6
The GCF of 16, 24, 30, and 42 is 2.
The Greatest Common Factor of 30, 40: 10
Since 24 is a factor of 144 (24 * 6 = 144), 24 is the greatest common factor. ■
No, 3 is not a factor of 40.