42
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The LCM of 2, 3, and 7 is 42.
Each are prime so: LCM = 2*3*7 = 42
84=2*2*3*7105=5*3*7147=3*7*73*7*2*2*5*7=2940
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
7 its self is the smallest multiple of 7 and is also 2 x 3.5.