It is: 110
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Since 11 is a prime number and does not evenly go into 28 or 2, then the least and only common denominator is 1.
6
You need at least 2 numbers to get a lowest common denominator. The lowest denominator for 238 is 1, but as there is no other number in the question, there is no common denominator.
There can be no greatest common denominator. If you have a set a numbers whose least common denominator is L then 2*L, 3*L, … are all common denominators. There is no end to that sequence and so no greatest.
The Least Common Multiple of 3, 2, and 11 is 66.