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| 2156: | 2 | 2 | 7 | 7 | 11 | |
| 4004: | 2 | 2 | 7 | 11 | 13 | |
| GCF: | 2 | 2 | 7 | 11 |
The Greates Common Factor (GCF) is: 2 x 2 x 7 x 11 = 308
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