220 = 2 ^2 x 5 x 11
1410 = 2 x 3 x 5 x 47
Therefore the LCM is
31020 = 2 ^ 2 x 3 x 5 x 11 x 47
(This is calculated by finding the highest power of all the primes in both numbers (as listed above) anc multiplying them together.
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