Redline

Intermediate → Olympiad

A worked solution with exactly one wrong step. You're not solving it — you're grading it. Catch the flaw and build a rating for rigour.

Open Redline
(1)

a=ba = b

(2)

a2=aba^2 = ab

(3)

a2−b2=ab−b2a^2 - b^2 = ab - b^2

(4)

a+b=ba + b = b

the flaw

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Redline

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