0 votes 0 votes Let $n, r, s$ be positive integers, each greater than $2.$ Prove that $n^{r}-1$ divides $n^{s}-1$ if and only if $r$ divides $s.$ Others isi2019-pcb-mathematics descriptive + – admin asked Aug 8, 2022 • edited Aug 27, 2022 by Lakshman Bhaiya admin 74 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.