LCM of 15 and 39 is 195.
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The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 15 and 39 is 3. Therefore, the least common multiple of 15 and 39 is 15 x 39 ÷ 3 = 195.
The LCM of the given three numbers is 780
1092
156
390