Multiply them together.
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When all of them are prime numbers,then just multiply the numbers to get the LCM of those 3 numbers.
What you do is multiply all 3 numbers together.
Product of the two prime numbers is the LCM. For example 3, 7 have 21 as LCM
3 and 17 are both prime. Any time you have prime numbers, you multiply them together to get the LCM.
The two numbers are prime so their LCM is their product, which is 51.