Q: What are te first three common multiples of 9 and 21?

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If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.

21, 42 and 63

21

7, 14, 21

63, 126, 189

42, 84, 126

63, 126, 189

84, 168, 252

126, 252, 378

126, 252, 378 and so on.

Any multiple of 21.

LCM(9, 21) = 63 so the numbers are 63, 63*2 and 63*3.