51 is a Prime number. Therefore the least common denominator would be 51*4.
51*4=204
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The least common denominator for 4 5 and 11 is 1.
4/17 can be written 40/170, and 3/10 can be written as 51/170. When written that way they have (least) common denominator 170.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
A common denominator, though not the least one, is 6*4 = 24.
A common denominator, though the least, is 48.