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Question

Find L.C.M. of: 72,84,126

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Solution

First we write all numbers as product of their prime numbers.
So, 72=2×2×2×3×3
84=2×2×3×7
126=2×3×3×7
We then choose each prime number with the greatest power and multiply them to get the LCM.
=>LCM=2×2×2×3×3×7=8×9×7=504

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