252
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The LCM is: 72
The Least Common Multiple (LCM) for 20 18 is 180.
The common multiples of 9 and 16 are 144, 288, 432 and so on.
lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.
It is: 1806