I am preparing for an exam, and I came across this puzzle(aptitude) question.

The question is to Pick the 'odd one out' and there are four options given.

146, 821, 704, 603

The correct answer is 603. Can somebody explain why that is?

  • 1
    $\begingroup$ Hi Max, welcome to Puzzling :) Can you provide us with some extra context for this question, please? Was this in a test somewhere, or a newspaper - where did you find it? Was it one of a set of questions that shared a particular theme? And was the question presented just like this - text-only - or were there any images or special fonts involved? (This info might help us make some headway, as odd-one-out puzzles can often have multiple justifiable answers...) Thanks! $\endgroup$
    – Stiv
    May 31, 2023 at 14:30
  • $\begingroup$ (My suspicion is that 603 is the odd-one-out because the digits of all the other numbers sum to 11, but this might be 'too simple' for certain puzzle set-ups, and if there is additional context then this usually helps get a firmer answer...) $\endgroup$
    – Stiv
    May 31, 2023 at 14:35
  • $\begingroup$ @stiv Your comment makes sense. I think that is the logic behind the answer. Can you help me with one more,(Currently I can't post on the forum). Odd one out among 214, 350, 520, 738. The correct answer is 214. $\endgroup$
    – Max
    May 31, 2023 at 14:38
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    $\begingroup$ @Max One question per question, please. You'll just have to wait out the timer - it's meant to keep new folks from flooding the site until they learn the ropes. Also, please tell us what the source of these problems is. We require proper attribution. $\endgroup$
    – bobble
    May 31, 2023 at 15:10

1 Answer 1


It could be [603] as all the other's digits add up to 11.






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