Find the odd one out: ​​

Logic: Sum of digits = 6

Now, we check each options.

Option (a): 231 (Follow)

2 + 3 + 1 = 6

Option (b): 123 (Follow)​

1 + 2 + 3 = 6

Option (c): 312 (Follow)​

3 + 1 + 2 = 6

Option (d): 124 (Not Follow)​

1 + 2 + 4 $$\neq$$ 6​

Thusm correct option is (d).