Answer :

13 x 3 = 39
13 x 5 = 65
The GCF is 13
[tex]39|3 \\13|13 \\ 1 \\\\ 39=3*13 \\\\ 65|5 \\ 13|13 \\1 \\\\ 65=5*13 \\\\ G.C.F(39;65)=13[/tex]

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