Saved Bookmarks
| 1. |
What is the common difference of an AP in which a²¹-a⁷=84? please solve and send pic. |
|
Answer» a²¹-a⁷=84 {a+(21-1)d}-{a+(7-1)d}=84 {a+20d}-{a+6d}=84 a+20d-a-6d=84 20d-6d=84 14d=84 d=84/14 d=6 |
|