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| 2100: | 2 | 2 | 3 | 5 | 5 | 7 | ||
| 1680: | 2 | 2 | 2 | 2 | 3 | 5 | 7 | |
| GCF: | 2 | 2 | 3 | 5 | 7 |
The Greates Common Factor (GCF) is: 2 x 2 x 3 x 5 x 7 = 420
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