If `S_(n)` is the sum of the first n terms of an A.P. then : (a) `S_(3n)=3(S_(2n)-S_n)` (b) `S_(3n)=S_n+S_(2n)` (c) `S_(3n)=2(S_(2n)-S_(n)` (d) none of these
A. `S_(3n)=3(S_(2n)-S_(n))`
B. `2.S_(3n)=S_(n)+S_(2n)`
C. `S_(3n)=2(S_(2n)-S_(n))`
D. none of these
A. `S_(3n)=3(S_(2n)-S_(n))`
B. `2.S_(3n)=S_(n)+S_(2n)`
C. `S_(3n)=2(S_(2n)-S_(n))`
D. none of these
Correct Answer – A