Skip to content / Đến nội dung
ThichHocToan.com

TIMO 2017 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 5 Question 8

TIMO · TIMO 2017 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 5

Question 8

Compute $\displaystyle\sum_{k=2}^{10}\frac1{k^2-1}$.
  1. $36/55$
  2. $72/55$
  3. $5/11$
  4. $10/11$