Answers

2016-01-07T17:28:17+08:00
Prime factorization...
42 =         2 × 3 × 7
126 =       2 × 3 × 7 × 3
210 =       2 × 3 × 7      × 5 × 2

2 × 3 × 7 = 42

Therefore, their GCF is 42.
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