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Exhaustion

Find the positive integer solutions of the equation (1+1/a)(1+1/b)(1+1/c) = 2

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Dodgy Proofs

What is wrong with these dodgy proofs?

Code to Zero

Stage: 5 Challenge Level: Challenge Level:1

Can you use your knowledge of place value to write down an algebraic relation linking $a$, $b$ and $c$?