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watch series cancel themselves · drag terms to collide · classic telescoping identities · runs locally

terms N
8
telescopingmatching terms will cancel — hit collapse to see itS_8 = 0.8889 → 1.0000
∑ 1/(k(k+1)) = ∑ [1/k − 1/(k+1)]= 1 − 1/(N+1) → 1
ready