The LCM is: 42
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lcm(2, 3, 7, 11) = 462.
LCM(5, 3, 7, 2) = 210
lcm(49, 63, 21) = 441 49 = 7^2 63 = 3^2 x 7 21 = 3 x 7 lcm = 3^2 x 7^2 = 441
lcm(6, 7, 45) = 630. 6 = 2 x 3 7 = 7 45 = 3^2 x 5 lcm = 2 x 3^2 x 5 x 7 = 630
3: 3 28: 7, 2, 2 21: 7, 3 LCM = 3x7x4 = 84