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They only have a common factor of one(1), so the product of 13 & 15 is the same as the LCM. 195
Their product.
LCM(10, 15, 13) = 390.
The LCM is: 195
The LCM is: 390
13 is prime. The LCM will therefore have to be the product of these two numbers.
lcm(13, 15) = 195
The GCF is 1. The LCM is 195.
It is: 390
195
390
104