The answer is simple 1 over 8 or in other words 1/8.
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Least common denominator means the LCM (least common multiple) of the denominator of a set of fractions. However, here is only 1 number provided in the question, 72, and even then 72 is not a fraction. Therefore, there is no least common denominator for 72.
72
72
72
LCD(49, 72) = 3528