Which pair of numbers have a GCF of 7? Choose all answers that are correct. A. 7 and 14 B. 7 and 1 C. 28 and 7 D. 21 and 3

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Hello there. 

Which pair of numbers have a GCF of 7? Choose all answers that are correct. A. 7 and 14 B. 7 and 1 C. 28 and 7 D. 21 and 3

Answer: 
21 and 3

21 and 3 Your welcome