find the LCM of 40,36and 84
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2÷40,36,84
2/20,18,42
2/10,9,21
2/5,9,21
3/5,3,7
3/5,1,7
5/1,1,7
7/1,1,1
LCM=2×2×2×2×3×3×5×7=5040
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