7 is a factor of 35.
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7
For 35, 5 and 7 For 98, 2 and 7
3 is a factor of 21, so ignore it. 21 factors to [3 7] 35 factors to [5 7] common factor [7] LCM = 21 * 35 / 7 = 105 ■
7 and 35
List their prime factors: 14 = 2 x 7, 35 = 5 x 7. The only common factor is 7