In the following question, select the odd group of numbers from the given alternatives.

Logic: 1st number + 4 = 2nd number and 2nd number + 8 = 3rd number

Now, we check each options.

Option (a): (11, 15, 23) (Follow)

11 + 4 = 15, 15 + 8 = 23

Option (b): (43, 47, 55) (Follow)​

43 + 4 = 47, 47 + 8 = 55

Option (c): (13, 17, 29) (Not Follow)​

13 + 4 = 17, 17 + 8 $$\neq$$ 29 ​

Option (d): (31, 35, 43) (Follow)​

31 + 4 = 35, 35 + 8 = 43

Thus, correct option is (c).