Last updated at May 29, 2018 by Teachoo

Transcript

Example 11 Find the sum of the first 22 terms of the AP : 8, 3, 2, . . . 8,3, 2, We have to find sum of first 22 terms . Sum = /2 (2a + (n 1) d) Here n = 22, a = 8 d = 3 8 = 5 Putting there values in formula, Sum = /2 [2 +( 1) ] = 22/2[2 8+(22 1)( 5)] = 11[16+(21)( 5)] = 11[16 105] = 11[ 89] = 979

Finding sum of n terms

Chapter 5 Class 10 Arithmetic Progressions

Concept wise

- Checking if AP or not and finding a, d
- Finding nth term
- Finding n
- Finding AP
- Finding nth term from end
- Divisible/ multiples
- Statement questions - nth term
- Finding sum of n terms
- Finding number of terms given s
- Given nth term finding s
- Statement questions - Sum of n terms
- Determining AP and finding sum

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.