The least common multiple (LCM) of 7, 18, and 63 is 126.
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7 14 21 28 35 42 49 56 63 9 18 27 36 45 54 63 lowest common multiple therefore is 63.
It is infinite but the LCM is 63
18/63 = 2/7
1 and 63 are one possible pair.
LCM OF 9,3 AND 21 IS 63. CHECK FOR YOURSELF IF YOU ARE NOT SURE.