Saved Bookmarks
| 1. |
The first and the last terms of an A.P are 8 and 350 respectively.if its common difference is 9 ,how many terms are there and what is their sum |
|
Answer» Formula of N= a+(n-1)d 350=8+(n-1)9 350=8+9n-9 9n=351 n=39 now sum=n/2(a+l) 39/2(8+350) 39/2×358=39×179=6981 hope U can UNDERSTAND thank you pls FOLLOW me |
|