Odd one out ?

Which number is the odd one out ?

9455,7568,4246,8729,3124,7639,6467,

I guess the odd number is 3124, since it is the only one not requiring
both hands when typed correctly on a standard keyboard.

Coyote

Actually, it IS a correct solution. Given the limited amount of
information in the original problem, it solves the problem. My answer
simply is one of at least two correct answers, and is obviously not the
one you are looking for. But, does that make it "wrong"?

Would you like to update the problem including more specific
requirements, everyone could perhaps take another look.\

Coyote

In all but one case the outside numbers multiplied together gives the
number in the middle eg 4246 , 4x6=24

Of course any of the numbers could be the odd one out, given sufficiently complicated
reasoning.