There an infinite number of common multiples of 2, 3 and 18.
The least of these is 18.
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The Least Common Multiple (LCM) of 18 and 8 is 72, which is the multiple of the highest power of prime factors in the given numbers (2^3 x 3^2).72
Prime factors of 18 are 2, 3 and 3 or as 2 and 32 Prime factors of 28 are 2, 2 and 7 or as 22 and 7 Least common multiple = 22*32*7 = 252
18 (3 * 6, 6 * 3, 9 * 2)
The LCM of these numbers is 18. LCM is Least Common Multiple.
The least common multiple of 3 , 2 , 5 = 30