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| 420: | 2 | 2 | 3 | 5 | 7 | |
| 340: | 2 | 2 | 5 | 17 | ||
| LCM: | 2 | 2 | 3 | 5 | 7 | 17 |
The Least Common Multiple (LCM) is: 2 x 2 x 3 x 5 x 7 x 17 = 7140
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