The pusillanimous goal of practising simple logical thinking (e.g. picking the easy option given a number sequence) pales to too little as compared with the value of using more comprehensive thinking to explore a subject, this being undermined by reaching an answer too superficially or habitually, because that in turn psychologically blocks further opportunity to see the bigger picture.

In this case, the OP needs at least to gather more information rather than find a logical substitute.

See Six Thinking Hats by Edward de Bono for a more precise and comprehensive evaluation of what missed opportunities are at stake.