Sol.
Q. 19. If the sum of first 7 terms of an A.P. is 49 and that of first 17 terms is 289, find the sum of first n terms.
Sol. Let a be the I term, and d be the common difference.
| Mathematics 2008 Question Papers Class X | |||||||
| Delhi | Outside Delhi | Compartment Delhi | Compartment Outside Delhi | ||||
 |
All Sets(PDF) | |
Set 1 | |
Set 1 | ||
|
Set 2 | |
Set 2 | ||||
|
Set 3 | |
Set 3 | ||||
