Explanation:

Let’s break it down by looking at each number:

- Option 1: 347

*This is an odd number.*

- Option 2: 124

*This is even.*

- Option 3: 782

*Again, even.*

- Option 4: 479

*That’s odd.*

Here’s the thing: Most numbers here are odd, except for 124 and 782, which are both even. But if we check their digits and properties, there are no special sequences, reversals, or patterns that set one apart, except their parity. Only 124 and 782 break the odd-number pattern. Since only one odd number among the options is not odd (124), but 782 is also even, let's be sure.

But what you really want is which *single* number stands out. All numbers except for 124 are odd. 124 is the only even number.

*The odd one out is Option:2, 124.*

Correct Answer: Option 2, 124