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124 2 * 62 2 * 2 * 31
The only factors for 62 are 2 and 31 31 is not a factor of 100 but 2 is so the answer to your question is: 2
31. Factor each number: 62 = 2 x 31 217 = 7 x 31 155 = 5 x 31. The only factor that is common to all three numbers (and thus, the greatest common factor) is 31.
Everything except 1, 2, 4, 31, 62, 124
740 /\ 10 74 /\ /\ 5 5 2 31