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10920 is the LCM. 130 = 5 x 2 x 13; 56 = 7 x 2 x 2 x 2; 42 = 7 x 3 x 2
You take the least amount of each factor that can produce each number.
So 5 x 2 x 13 x 7 x 2 x 2 x 3 = 10920
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