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

40 fully worked proof questions for OCR A A-Level Mathematics (H240, spec 1.01), every line explained and annotated to the real OCR M/A/B/SC mark scheme. Covers all four OCR proof methods: proof by deduction, proof by exhaustion, disproof by counter-example, and proof by contradiction (including the spec-named irrationality of root 2 and the infinity of the primes), plus the OCR logical connectives implies, is-implied-by and if-and-only-if. Progressive difficulty from Easy to Challenging with a key-facts reference box. Ideal for revision, homework and cover lessons.