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The formula, which is simpler to apply than to write out(!) is

If

X1 = pa1qb1rc1 ...

and

X2 = pa2qb2rc2 ...

where p, q, r etc are prime numbers and a, b, c etc are integers.

Then

LCM(X1, X2) = pmax(a1,a2)*qmax(b1,b2)*rmax(c1,c2) ...

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Q: What is the formula for LCM?
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