NCERT Solutions for Class 10 Maths Chapter 5

Important NCERT Questions

Arithmetic Progression

NCERT Books for Session 2022-2023

CBSE Board and UP Board Others state Board

EXERCISE 5.3

Page No:107

Questions No:1

# Find the sum of the following APs: 2, 7, 12, . . ., to 10 terms.

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A.P.: 2, 7, 12, …

Here, a = 2 and d = 7 – 2 = 5

The sum of n terms of an AP is Given by

Sn = n/2[2a + (n -1)d]

⇒ S_10 = 10/2[2(2) + (10 – 1)(5)]

⇒ S_10 = 5[4 + 45] = 245.