1, and only 1. There are no common factors (whole numbers) between those three numbers but one.
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LCM(Least Common Multiple) as the name suggests is the common multiple of two numbers. Thus, LCM of a single number cannot be found out.
factor 12=2*2*3 20=2*2*5 25=5*5 LCM=2*2*3*5*5=300
Least Common Multiple (LCM) for 3 5 3 5 is 15.
60Prime Factorization of :6 = ...... 2 * 312 = .....2 * 3 * 215 = ..........3..... * 5==============LCM = 2 * 3 * 2 * 5 = 60
420 35 = 5 x 7 12 = 22 x 3 lcm = 22 x 3 x 5 x 7 = 420