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Problem Bank · seq-3

Sequences & Series · TelescopingAIME style●●●● 7/10~5 min0:00
Let S=k=1991k(k+1)S = \sum_{k=1}^{99} \tfrac{1}{k(k+1)}. If S=mnS = \tfrac{m}{n} in lowest terms, what is m+nm + n?
telescopingpartial-fractions