Disproof by Counter Example (Edexcel A-Level Mathematics): Flashcards

Collapses/disproves it

One

General statements (using 'all', 'every', 'for every')

Understand the statement

One example that does NOT satisfy the statement

$6$

$15$

$15 = 5 imes 3$ (composite)

False, counterexample: $n=4$ gives $15$ (not prime)

$2$ (prime but even)

Only divisors are $1$ and $2$

The statement is false