Stage: 5 Challenge Level: 
Can you use your knowledge of place value to write down an algebraic relation linking $a$, $b$ and $c$?
Place value. Divisibility. Proof by exhaustion. Stage 5 - Reviewed 2012. Mathematical reasoning & proof. Factorisation (algebraic). epsilons. Inequality/inequalities. Number bases. Diophantine equations.
Published December 2000.
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