42 prime factors -----> 2,3,7
105 prime factors -----> 3,5,7
There is 3 and 7 in common :
There fore 3*7 = 21;
21 is the greatest common factor.
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LCM(42, 70, 105) = 210
The Greatest Common Factor of 28, 42, 63: 7
Yes, 3 a common factor of 9 18 and 42
Greatest common factor of 42 and 280 is 14.
The highest common factor is 21