0 votes 0 votes What is the value of the following expression? $\frac{1}{2^2 -1} + \frac{1}{4^2 -1} + \frac{1}{6^2 -1} + \dots + \frac{1}{20^2 -1}$ $\frac{9}{19}$ $\frac{10}{19}$ $\frac{10}{21}$ $\frac{11}{21}$ Quantitative Aptitude cat2000 quantitative-aptitude sequences&series + – go_editor asked Mar 28, 2016 • edited Apr 13, 2022 by Lakshman Bhaiya go_editor 13.9k points 339 views answer comment Share See all 0 reply Please log in or register to add a comment.