There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
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The answer is 3 over 8 or 3/8
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.
What is the least denominator of 2 and 3
The least common denominator is 120.
A common denominator, though not the least, is 80.