1 can only be an LCM (least common multiple) if the numbers you're trying to find an LCM for are 1 and 1. LCM cannot be smaller than the largest of the numbers you're using.
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The LCM of 1 and 7 is 7.
What is the LCM of 1 and any other number greater than 1 ?
Since they are relatively prime, (their GCF is 1) the LCM is their product.
1
You have to multiply the two numbes together to get the LCM.