Probability | OCR A A-Level Maths | 40 Worked Examples (H240)

A complete 40-question worked-solutions pack on Probability for OCR A A-Level Mathematics A (H240), covering the whole of specification section 2.03: mutually exclusive and independent events, tree diagrams, Venn diagrams, sample-space diagrams and two-way tables, the addition rule P(A or B) = P(A) + P(B) - P(A and B), the multiplication rule P(A and B) = P(A) x P(B given A), conditional probability from first principles, set notation, and modelling with probability including critiquing assumptions. Every question is graded Easy, Standard or Challenging and every solution is fully broken down: one atomic step per line, a plain-English note on every line explaining what it does, and OCR mark-scheme codes (M, A, B) folded in on the real credit-earning steps. The pack matches OCR conventions exactly, including that non-exact answers are given to 3 significant figures, the detailed-reasoning questions show every product rather than quoting a calculator value, and Bayesian-style reversals are handled through tree diagrams rather than by the excluded algebraic inversion of a conditional probability. Diagram-rich, with tree diagrams, Venn diagrams and a two-dice sample-space grid drawn inline. Ideal for revision, homework, or as ready-made teaching examples. 29 pages.