200
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The least common multiple of 5, 6, and 25 is 150.
50
The LCM is: 175
7 is prime, so it's lowest common multiple with anything that isn't itself a multiple of 7 (in which case the LCM would just be the other number itself) is that number times seven (in this case, 175).
The greatest common multiple of any set of integers is infinite.