It is 42
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LCD(6, 8) = 24
21
LCD(7,9,13) = 7*9*13 which is 819
The LCD of x, 5, 7, 15 is 105x.
The factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42. The factor pairs of 42 are 1 x 42, 2 x 21, 3 x 14, and 6 x 7.1, 2, 3, 6, 7, 14, 21, 42.1 2 3 6 7 21 14 42