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 = a2 – a1 = 10 – 7 = 3
As 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.