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| 42120: | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 5 | 13 |
| 120: | 2 | 2 | 2 | 3 | 5 | ||||
| GCF: | 2 | 2 | 2 | 3 | 5 |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 3 x 5 = 120
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