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33 = 3 x 11

39 = 3 x 13

Note that there are 3 columns ( 3, 11, 13) and they are all prime numbers (prime factorisation)

To find the LCM, multiply the highest number in each column, so, 3 x 11 x 13 = 429

So, the LCM is 429

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13y ago

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