Saved Bookmarks
| 1. |
If nineth term of A. P. is (2n+1)what is sum of its first three terms |
| Answer» 2*1+1=3(n=1)2*2+1=5(n=2)2*3+1=7(n=3)Required AP:3,5,7....Sum of first three terms :t1+t2+t3 3+5+7=15(ans.) | |