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The greatest common factor (GCF) of 8 and 21 is 1. To find the GCF, you need to determine the largest number that divides evenly into both 8 and 21. In this case, 1 is the only number that can evenly divide both 8 and 21 without leaving a remainder. Therefore, the GCF of 8 and 21 is 1.
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