STEP 2024: 19 of 24 questions decoded, by method & chapter.

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The paper at a glance, coloured by move. Click a square to open its question; empty squares are not decoded yet.

• 1Reduce Modulo a Well-Chosen ModulusKey methodPureProof & Number Theory2 other sittings

  Same method, other sittings

  20182020

  Worked solutionOpen the method
• 2Term-by-Term Series IntegrationKey methodPureIntegration2 other sittings

  Same method, other sittings

  20092018

  Worked solutionOpen the method
• 3Weierstrass SubstitutionKey methodPureTrigonometry2 other sittings

  Same method, other sittings

  20092023

  Worked solutionOpen the method
• 4Affine Combinations & the Section FormulaKey methodPureVectors & Matrices6 other sittings

  Same method, other sittings

  200620082009201220142015

  Worked solutionOpen the method
• 5Exhaust the Factor PairsKey methodPureFunctions & Curve Sketching3 other sittings

  Same method, other sittings

  201120132023

  Worked solutionOpen the method
• 6Coefficient MatchingKey methodPureCombinatorics & Binomial1 other sitting

  Same method, other sittings

  2016

  Worked solutionOpen the method
• 7Quadratic → DiscriminantKey methodPureCoordinate Geometry & Conics3 other sittings

  Same method, other sittings

  201520172025

  Worked solutionOpen the method
• 8Interleaved Monotone SubsequencesKey methodPureSequences & Series2 other sittings

  Same method, other sittings

  20132023

  Worked solutionOpen the method
• 9Projectiles → Split by AxisTunnelMechanics11 other sittings

  Same method, other sittings

  20062008200920102012201320142017202020222023

  Worked solutionOpen the method
• 11Indicators + Linearity of ExpectationKey methodProb & StatsProbability & Statistics4 other sittings

  Same method, other sittings

  2008201120132021

  Worked solutionOpen the method
• 12Order Statistics from the CDFKey methodProb & StatsProbability & Statistics3 other sittings

  Same method, other sittings

  201820202023

  Worked solutionOpen the method

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The paper at a glance, coloured by move. Click a square to open its question; empty squares are not decoded yet.

• 1Telescoping SumsKey methodPureSequences & Series6 other sittings

  Same method, other sittings

  201220142015201620172022

  Worked solutionOpen the method
• 3Derivative Sign → InequalitiesKey methodPureDifferentiation2 other sittings

  Same method, other sittings

  20172018

  Worked solutionOpen the method
• 4Sum & Product of ParametersKey methodPureCoordinate Geometry & Conics4 other sittings

  Same method, other sittings

  2009201620172023

  Worked solutionOpen the method
• 8Quadratic → DiscriminantKey methodPureCoordinate Geometry & Conics3 other sittings

  Same method, other sittings

  201520172025

  Worked solutionOpen the method
• 9Oblique ImpactKey methodMechanics4 other sittings

  Same method, other sittings

  2008201920212025

  Worked solutionOpen the method
• 10Limiting EquilibriumTunnelMechanics10 other sittings

  Same method, other sittings

  2006201220132014201720182019202020222023

  Worked solutionOpen the method
• 11Inclusion-Exclusion & SymmetryKey methodProb & StatsProbability & Statistics2 other sittings

  Same method, other sittings

  20162019

  Worked solutionOpen the method
• 12Geometric ProbabilityKey methodProb & StatsProbability & Statistics3 other sittings

  Same method, other sittings

  200620122022

  Worked solutionOpen the method