Saved Bookmarks
| 1. |
The difference between the 15th term and the 5th term of an A.P is 40. Which number is to be added to its 12 |
|
Answer» The difference between the 15th term and the 5th term = 40 i.e., ten times an of a common difference = 40 Common difference = 40/10 = 4 When we add 8 x common difference we will get 20th term. The difference between the 12th term and the 20th term = (20 – 12) × common difference = 8 x 4 = 32 The difference between the first term and the 21th term = (21 – 1) × Common difference = 20 × = 80 |
|