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  • Factors of 21: 1, 3, 7, 21.
  • Factors of 308: 1, 2, 4, 7, 11, 14, 22, 28, 44, 77, 154, 308.
  • GCF (21, 308) = 7
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Q: What is the greatest common factor of 21 and 308?
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