Answer :

The greatest common factor for 24,36,60 and 84 is 12


24 - 1,2,3,4,6,8,12,24

36 - 1,2,3,4,6,9,12,18,36

60 - 1,2,3,4,5,6,10,12,15,20,30,60

84 - 1,2,3,4,6,7,12,14,21,28,42,84

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