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The common factors of 30 and 40 are 1, 2, 5 and 10.

30: 1, 2, 3, 5, 6, 10, 15, 30

31: 1, 31

32: 1, 2, 4, 8, 16, 32

33: 1, 3, 11, 33

34: 1, 2, 17, 34

35: 1, 5, 7, 35

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

37: 1, 37

38: 1, 2, 19, 38

39: 1, 3, 13, 39

40: 1, 2, 4, 5, 8, 10, 20, 40

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12y ago

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