STEP 2019: 16 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.

• 3Reuse the Earlier ResultPavlovPureProof & Number Theory5 other sittings

  Same method, other sittings

  20082009201320162020

  Worked solutionOpen the method
• 4Halving Products → TelescopingKey methodPureSequences & Series2 other sittings

  Same method, other sittings

  20122022

  Worked solutionOpen the method
• 5Constant & Periodic SequencesKey methodPureSequences & Series3 other sittings

  Same method, other sittings

  200620082017

  Worked solutionOpen the method
• 6Sketching Without SolvingKey methodPureDifferential Equations2 other sittings

  Same method, other sittings

  20182021

  Worked solutionOpen the method
• 7The Vanishing Vertex-SumKey methodPureVectors & Matrices4 other sittings

  Same method, other sittings

  2012201320212023

  Worked solutionOpen the method
• 8The Determinant BridgeKey methodPureVectors & Matrices1 other sitting

  Same method, other sittings

  2021

  Worked solutionOpen the method
• 10Limiting EquilibriumTunnelMechanics10 other sittings

  Same method, other sittings

  2006201220132014201720182020202220232024

  Worked solutionOpen the method
• 12CDF of a Transformed VariableTunnelProb & StatsProbability & Statistics8 other sittings

  Same method, other sittings

  20092012201420152017202020212022

  Worked solutionOpen the method

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• 9
• 10
• 11
• 12

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

• 1Eliminating Between Coupled ODEsKey methodPureDifferential Equations2 other sittings

  Same method, other sittings

  20122020

  Worked solutionOpen the method
• 5Weierstrass & Structured SubstitutionsTunnelPureIntegration4 other sittings

  Same method, other sittings

  2008200920142020

  Worked solutionOpen the method
• 6Locus of $w=f(z)$TunnelPureComplex Numbers2 other sittings

  Same method, other sittings

  20112020

  Worked solutionOpen the method
• 7Range → Discriminant ConditionKey methodPureFunctions & Curve Sketching2 other sittings

  Same method, other sittings

  20162020

  Worked solutionOpen the method
• 8Perpendicularity → Dot Product ZeroParallel & Perpendicular SplitKey methodPureVectors & Matrices6 other sittings

  Same method, other sittings

  200820112017202020212022

  Worked solutionOpen the method

  AlsoParallel & Perpendicular Split
• 9Motion on a Smooth CurveKey methodMechanics4 other sittings

  Same method, other sittings

  2012201620182021

  Worked solutionOpen the method
• 101D Collisions → Two ScalarsOblique ImpactTunnelMechanics10 other sittings

  Same method, other sittings

  2006200820092011201320182021202220242025

  Worked solutionOpen the method

  AlsoOblique Impact
• 12Inclusion-Exclusion & SymmetryKey methodProb & StatsProbability & Statistics2 other sittings

  Same method, other sittings

  20162024

  Worked solutionOpen the method