42
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The Least Common Multiple (LCM) for 2 6 18 21 is 126.
If that's 21, 15 and 6, the LCM is 210. If that's 2115 and 6, the LCM is 4230.
The LCM is 84.
No, the LCM is 6.
The answer is 42. 6 x 7 equals 42. 21 x 2 equals 42.