Proof (Edexcel GCSE Maths): Flashcards

$2n$ (where $n$ is any integer)

$2n + 1$ (where $n$ is any integer)

$n$, $n + 1$, $n + 2$, etc.

Rearrange expressions to show one thing equals another

Equal for all possible values of the variable

Only one

Use algebraic representations and manipulation

Find one counterexample where statement fails

Always odd

$2a + 1$, $2b + 1$, $2c + 1$