One of the most important and exam oriented question from Chapter name- Arithmetic Progression

Class 10th

Chapter number- 9

Exercise :- 9.4

This type of question has been asked in previous years exams.

In this question we have been given an arithmetic progression. And we have to find IF 68 is a term of the A.P. 7, 10, 13,…

CBSE DHANPAT RAI publication

Understanding CBSE Mathematics

Question 3(i)

Given that,

A.P. 7, 10, 13,…

from given series,

a = 7 and d = a

_{2}– a_{1}= 10 – 7 = 3As we know that, to find nth term in an A.P = a + (n – 1)d

we have to find at which position 68 is present in given series,

a + (n – 1)d = 68

7 + (n – 1)3 = 68

7 + 3n – 3 = 68

3n + 4 = 68

3n = 64

n = 64/3, which is not a whole number.