**What is an Arithmetic Progression?
What is the first term and common difference of arithmetic progressions?**

## Example Question Sum of n terms of Arithmetic Progression CBSE NCERT Exercise 5.3 Question 20

**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 20**

**20. In a potato race, a bucket is placed at the starting point, which is 5 meters from the first potato, and the other potatoes are placed 3 meters apart in a straight line. There are ten potatoes in the line. A competitor starts from the bucket, picks up the nearest potato, runs back with it, drops it in the bucket, runs back to pick up the next potato, runs to the bucket to drop it in, and she continues in the same way until all the potatoes are in the bucket. What is the total distance the competitor has to run?**

## Example Question Sum of n terms of Arithmetic Progression CBSE NCERT Exercise 5.3 Question 19

**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 19**

**19. 200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on. In how many rows are the 200 logs placed and how many logs are in the top row?**

## Example Question Sum of n terms of Arithmetic Progression CBSE NCERT Exercise 5.3 Question 18

**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 18**

**18. A spiral is made up of successive semicircles, with centers alternatively at A and B, starting with center at A, of radii 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, ... What is the total length of such a spiral made up of thirteen consecutive semicircles.**

## Sample Question Sum of n terms of Arithmetic Progression CBSE NCERT Exercise 5.3 Question 17

**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 17**

**17. In a school, students thought of planting trees in and around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be the same as the class, in which they are studying, e.g, a section of Class I will plant 1 tree, a section of class II will plant two trees and so on till Class XII. There are three sections of each class. How many trees will be planted by the students?**

- 1
- 2
- 3
- …
- 10
- Next Page »