0 votes 0 votes If $pqr=1$ then $\frac{1}{1+p+r^{-1}} + \frac{1}{1+q+r^{-1}} + \frac{1}{1+r+p^{-1}} $ is equivalent to $p+q+r$ $\frac{1}{p+q+r}$ $1$ $p^{-1}+q^{-1}+r^{-1}$ Quantitative Aptitude cat2002 quantitative-aptitude algebra + – go_editor asked Mar 2, 2016 • edited Apr 9, 2022 by Lakshman Bhaiya go_editor 13.9k points 461 views answer comment Share See 1 comment See all 1 1 comment reply Leen Sharma 11.5k points commented May 7, 2016 reply Share @jothee Please check this question again.I think something is wrong in this question. 0 votes 0 votes Please log in or register to add a comment.