If `S_(n)` denotes the sum of first n terms of an A.P., then  `(S_(3n)-S_(n-1))/(S_(2n)-S_(n-1))` is
Channel: Doubtnut
Date: 24/05/2020

If `S_(n)` denotes the sum of first n terms of an A.P., then  `(S_(3n)-S_(n-1))/(S_(2n)-S_(n-1))` is equal to