STEP 2011: 19 of 26 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.

• 1Sweeping Lines for Root CountsKey methodPureFunctions & Curve Sketching4 other sittings

  Same method, other sittings

  2006201320142021

  Worked solutionOpen the method
• 2Exhaust the Factor PairsKey methodPureProof & Number Theory3 other sittings

  Same method, other sittings

  201320232024

  Worked solutionOpen the method
• 3Anchor Point & Derivative SignThe Sketch Is the ProofKey methodPureFunctions & Curve Sketching4 other sittings

  Same method, other sittings

  2009201320182023

  Worked solutionOpen the method

  AlsoThe Sketch Is the Proof
• 4General Solutions of Trig EquationsThe Chebyshev BridgePavlovPureTrigonometry4 other sittings

  Same method, other sittings

  2008201520172023

  Worked solutionOpen the method

  AlsoThe Chebyshev Bridge
• 5Perpendicularity → Dot Product ZeroKey methodPureVectors & Matrices4 other sittings

  Same method, other sittings

  2008201720192020

  Worked solutionOpen the method
• 6Reverse-Engineering the AntiderivativeKey methodPureIntegration4 other sittings

  Same method, other sittings

  2009201620202021

  Worked solutionOpen the method
• 7Characteristic Equation for RecurrencesTunnelPureSequences & Series3 other sittings

  Same method, other sittings

  200820102012

  Worked solutionOpen the method
• 8Parametric & Polar AreasTunnelPureIntegration2 other sittings

  Same method, other sittings

  20152023

  Worked solutionOpen the method
• 91D Collisions → Two ScalarsTunnelMechanics8 other sittings

  Same method, other sittings

  20062008200920132018201920222025

  Worked solutionOpen the method
• 10Explosions, Jerks & CapturesKey methodMechanics1 other sitting

  Same method, other sittings

  2016

  Worked solutionOpen the method
• 11Equilibrium at a JunctionKey methodMechanics2 other sittings

  Same method, other sittings

  20212022

  Worked solutionOpen the method
• 12First Step → Self-Referential EquationKey methodProb & StatsProbability & Statistics4 other sittings

  Same method, other sittings

  2014201520202021

  Worked solutionOpen the method
• 13Indicators + Linearity of ExpectationKey methodProb & StatsProbability & Statistics4 other sittings

  Same method, other sittings

  2008201320212024

  Worked solutionOpen the method

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• 3
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• 9
• 10
• 11
• 12
• 13

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

• 1Reduction of OrderKey methodPureDifferential Equationsonly this sitting

  Same method, other sittings

  This one has only struck here so far.

  Worked solutionOpen the method
• 2Infinite Descent & IrrationalityKey methodPureProof & Number Theory4 other sittings

  Same method, other sittings

  2013201520222023

  Worked solutionOpen the method
• 8Locus of $w=f(z)$TunnelPureComplex Numbers2 other sittings

  Same method, other sittings

  20192020

  Worked solutionOpen the method
• 10Centre-of-Mass FrameKey methodMechanics2 other sittings

  Same method, other sittings

  20162017

  Worked solutionOpen the method
• 12Probability Generating FunctionsKey methodProb & StatsProbability & Statistics4 other sittings

  Same method, other sittings

  2008200920182025

  Worked solutionOpen the method
• 13Mode via the Ratio TestKey methodProb & StatsProbability & Statistics2 other sittings

  Same method, other sittings

  20202025

  Worked solutionOpen the method