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120- 84 - 70 2
60 42 35 mcd =2
mcm
120- 84 - 70 2
60 42 35 2
30 21 35 2
15 21 35 3
5 7 35 5
1 7 7 7
1 1 1 mcm =2³ x 3x 5 x 7 =840