Odd One Out: Explanation

The given options are:

a) 234
b) 345
c) 456
d) 657

To find the odd one out, we need to look for a pattern or any distinct difference among the numbers.

1. Comparing the Units Digit:

- In option a) 234, the units digit is 4.
- In option b) 345, the units digit is 5.
- In option c) 456, the units digit is 6.
- In option d) 657, the units digit is 7.

2. Comparing the Tens Digit:

- In option a) 234, the tens digit is 3.
- In option b) 345, the tens digit is 4.
- In option c) 456, the tens digit is 5.
- In option d) 657, the tens digit is 5.

3. Comparing the Hundreds Digit:

- In option a) 234, the hundreds digit is 2.
- In option b) 345, the hundreds digit is 3.
- In option c) 456, the hundreds digit is 4.
- In option d) 657, the hundreds digit is 6.

From the comparison above, we can observe that all the digits in the units and hundreds place are changing systematically. However, in option d) 657, the tens digit is the same as in option c) 456.

Therefore, the odd one out is option d) 657 because it is the only number where the tens digit is different from the other options.

In summary, the odd one out is option d) 657 because it is the only number where the tens digit is different from the other options.