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Anonymous
Factor them.
3 x 5 = 15
39
3 x 3 x 5 = 45
Combine the factors, eliminating duplicates.
3 x 3 x 5 x 39 = 1755, the LCM.
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The LCM of 9 and 15 is 45.
45
The GCF is 15.
The LCM is 360.
The LCM is 60.