Answer:
13. COMMON FACTOR OF 4 & 12 = 4
GCF OF 4 & 12 = 4
14. COMMON FACTOR OF 3 & 15 = 3
GCF OF 3 & 15 = 3
15. COMMON FACTOR OF 10 & 20 = 10
GCF OF 10 & 20 = 10
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