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147.
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lcm(49, 63, 21) = 441 49 = 7^2 63 = 3^2 x 7 21 = 3 x 7 lcm = 3^2 x 7^2 = 441
The LCM is 441.
The Least Common Multiple (LCM) for 21 48 49 is 2,352.
The LCM is 588.
The LCM is: 147