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Find the greatest common factor of these pairs of numbers a.2and 4 b. 3 and 9 C. 10 and 15. d. 15 and 20 e. 14 and 24 f. 14 and 36 g. 18 and 30 h. 21 and 56. I. 21 and 33 j. 56 and 84 k. 55 and 65. l. 12 and 120