Saved Bookmarks
| 1. |
If 7times the 7th term of an AP is equal to 11 times the 11th term .find 18 th term |
|
Answer» 7(a+(7-1)d)=11(a+(11-1)d)7a+42d=11a+110d-4a=68d-a=17dWe have to find 18th termSo, a18=a+(18-1)d=a+17dAs we got value of 17d=-a,so put in this equation=a+(-a)=a-a=0 0 0 |
|