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What is the greatest common factor of 42, 126, and 210 ?
F. 2
G. 6
H. 14
J. 21
K. 42
prime factors of 42: 2x7x3 prime factors of 126: 2x3x3x7 prime factors of 210: 7x3x5x2 now we multiply all the factors that they all have in common: 2x3x7 which is 42. So the highest common factor is 42
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