Which one of (a), (b), (c), (d) or (e) is the odd one out and why?
Source: based on a puzzle from Alex Bellos
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I'm thinking it is
it itself is not an odd-one-out answer, though ironically, that makes it an odd-one-out as well. But hear me out on this one.
(a) is the only red number.
(b) is the only smaller-than-normal number.
(d) is the only number missing a segment.
(e) is the only one without a middle black segment.
I still don't know how to explain the title, though.
The problem with these sort of puzzles is that there are many possible answers. A few possible ones include these.
It is smaller than the others
It is red
It is not a fully written number
There is no black within it
This is just the start of hundreds, if not thousands of possible answers. I don't know if it intentional but it may be a good idea to be a bit more specific in the type of differences that you are looking for.