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The LCM of 3 and 15 is: 15. Since 15 is a multiple of 3 (3*5), the answer is just 15.
Factoring each number into product of primes: 3 = 3
15 = 3 x 5 The number 3 is a factor once for both numbers, ; Therefore, inlude 3 in answer The number 5 is a factor in 15; Include 5 in answer Therefore, LCM(3,5) = 3 x5 = 15 Additional content regarding LCM may be referenced at http://www.math.info/Arithmetic/LCM
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