# Ex 5.2, 4 - Chapter 5 Class 10 Arithmetic Progressions

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Ex 5.2 ,4 Which term of the A.P. 3, 8, 13, 18, is 78? 3, 8, 13,18, We need to find which term is 78 an = a + (n 1) d Hence, an = 78 a = 3 d = 8 3 = 5 Putting these in formula an = a + (n 1) d 78 = 3 + (n 1) 5 78 3 = (n 1) 5 75 = (n 1) 5 75/5 = (n 1) 15 = n 1 n 1 = 15 n = 15 + 1 n = 16 So, the 16th term of A.P. is 78

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.