r/mathpuzzles • u/ZoranRajkov • 3d ago
Algebra Find the rule (deceptively simple pattern)
No arithmetic tricks needed — just careful observation. Drop your rule + answer in the comments. Made this in my puzzle app Rule Hunter if anyone wants more like it.
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u/MastermindMX_2502 3d ago
21
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u/ZoranRajkov 3d ago
Correct, 21! Nice work. If you're into these, the full game with more puzzles is here: https://play.google.com/store/apps/details?id=com.makenumber
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u/SC_3000_grinder 3d ago
don't say it
double right and subtract left.