315
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The LCM of (5, 6, 7) is 210.
Only one can be least, which is 105. Two others include 210 and 315.
Multiples of 7 (first 5) : 7, 14, 28, 35Multiples of 5 (first 7) : 5, 10, 15, 20, 25, 30, 35The least common is then 35.
They are: 14, 28 and 42
35 and 70 both have 7 and 5 as prime factors