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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

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Q: What is the least common denominator of 21 and 6?
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What is the LCD for 21and 6?

42 is the least common denominator for 21 and 6


What is the least common denominator of 6 10 and 15?

Answer: 30 If those numbers are denominators, the least common denominator is the least common multiple of the three. In this case, 30 is the LCM of 6, 10 and 15, so 30 is the least common denominator.


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