write all the factors of number in each pair then find the common factors 1. 18 21
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write all the factors of number in each pair then find the common factors 1. 18 21
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Answer:
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Step-by-step explanation:
1, 2, 3, 6, 9, 18. Factors of 21: 1, 3, 7. The highest number that both sets contain is 3, so the GCF will be 3.