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The LCM of 16 and 64 is 64. Since 16 is a factor of 64, 64 is automatically the LCM of the pair.
LCD(4, 16, 64) = 64
1, 2, 4, 8, 16, 32 1, 2, 4, 8, 16, 32, 64
64 and 16's highest common factor is 16.
1, 2, 4, 8, 16, 32, 64 All but 1 and 2 are composite.