Class 10 Maths Chapter 5 Exercise 5.1 Q2 | AP Chapter Class 10 | NCERT 2026​

Class 10 Maths Chapter 5 – Arithmetic Progressions

Exercise 5.1 Question 2 Solution

Question 2: Write first four terms of the AP, when the first term aa and common difference dd are given.

Formula of AP:
a, a+d, a+2d, a+3da, a+d, a+2d, a+3d

(i) a=10, d=10a=10, d=10

First four terms:

10, 20, 30, 4010, 20, 30, 40

(ii) a=−2, d=0a=−2, d=0

First four terms:

−2, −2, −2, −2−2, −2, −2, −2

(iii) a=4, d=−3a=4, d=−3

First four terms:

4, 1, −2, −54, 1, −2, −5

(iv) a=−1, d=12a=−1, d=21​

First four terms:

−1, −12, 0, 12−1, −21​, 0, 21​

(v) a=−1.25, d=−0.25a=−1.25, d=−0.25

First four terms:

−1.25, −1.50, −1.75, −2.00−1.25, −1.50, −1.75, −2.00

Quick Concept

An Arithmetic Progression (AP) is a sequence where the difference between consecutive terms is always constant. That constant number is called the common difference (d). 

Trending Study Tip 🔥

Most Class 10 toppers practice AP questions by remembering this pattern:

a, a+d, a+2d, a+3da, a+d, a+2d, a+3d

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