The LCD for 17 and 12 is 204
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You need at least two fractions to determine a least common denominator.
34
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
204
It also called the lowest common factor .... so the L.C.M of 17 and 3 is 51