21, 42, 63 and so on.
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No but 21 is a multiple of 3 because 7*3 = 21
The Least Common Multiple (LCM) for 27 21 is 189.
The highest common multiple of 21 and 84 is infinity. The least common multiple, on the other hand, is 84, while the greatest common divisor is 21.
The least common multiple of 7 , 9 , 21 = 63
3 = (3)*15 + (-2)*21