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Past exam of the mathematics course of the University of Cambridge / 2023 / ii / Paper 1 / 2F / b / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2023 ii Paper 1 2F b
Created 2026-09-24 Updated 2026-09-25  0 By others on same topic  0 Discussions Create my own version
Because both fractions are reduced and q>v, they are distinct. Their difference is
​qp​−vu​​=qv∣pv−qu∣​.
(1)
The numerator is a nonzero integer, so its absolute value is at least one. Therefore
​qp​−vu​​≥qv1​>q21​​,
(2)
where the strict inequality uses v<q. This is the separation of distinct reduced fractions.

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