The GCF is 5. The LCM is 225. The GCM is infinite.
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There can be no GCM (Greatest Common Multiple). Suppose a GCM exists and suppose it is x. That is, x is the GCM of 7 and 13, then 2x is a multiple of both 7 and 13 and is greater than x. This contradicts the statement that x is the GCM. So x cannot be the GCM.
The GCM of any set of numbers is infinite.
45 of 25 is 180%
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