ChallengeHard ShareChallenge · Hard problemCompute ∣12−22+32−42+⋯+20252−20262∣\left|1^2 - 2^2 + 3^2 - 4^2 + \cdots + 2025^2 - 2026^2\right|12−22+32−42+⋯+20252−20262.Check Show answer Walk through it step by step Practice more like this