21
As 3 and 7 are relatively prime (their hcf = 1), their lcm is 3×7 = 21.
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There is none. A least common denominator is to be found between or among fractions. 3 and 7 are not fractions.
84/14 = 6 84/7 = 12 84/3 = 28 Hence 84 is the least common denominator
105
It is: 42
40