Bright Tutorials Bright Tutorials
CBSE Class 10 Mathematics Question 28 of 48

Arithmetic Progressions — Question Ex 5.3 Q10

Back to all questions
Ex 5.3 Q10
Question

Show that a1, a2, ……. an,…… form an AP where an is defined as below:
(i) an = 3 + 4n
(ii) an = 9 – 5n
Also find the sum of the first 15 terms in each case.

Answer

Arithmetic Progression Class 10 NCERT Solutions Pdf Ex 5.3 Q10

Arithmetic Progressions - CBSE Class 10 | CBSE Class 10 Maths | Bright Tutorials
BRIGHT TUTORIALS
Bright Tutorials Logo
BRIGHT TUTORIALS
CBSE Class X | Academic Year 2026-2027
9403781999
Excellence in Education
Mathematics | Arithmetic ProgressionsWeb Content

CBSE Class 10 Arithmetic Progressions — Complete Guide

AP is a high-scoring chapter carrying 5-6 marks. The nth term and sum formulae appear in every board exam.

Quick Revision: Key Concepts

  • AP: a, a+d, a+2d, ... (constant common difference)
  • nth term: an = a + (n−1)d
  • Sum: Sn = n/2[2a + (n−1)d] = n/2(a + l)
  • Key relation: an = Sn − Sn−1

Most Important Questions

  1. Find specific terms (nth term, last term)
  2. Find sum of first n terms
  3. Find number of terms when sum is given
  4. Application problems (salary, savings, stacking)

About Bright Tutorials

Bright Tutorials, Hariom Nagar, Nashik Road, provides expert coaching for CBSE and ICSE students. Our experienced faculty ensures comprehensive preparation for board exams with personalised attention and 3-tier differentiation for students of all levels. Contact us at 9403781999 or visit brighttutorials.in.

Bright Tutorials | Hariom Nagar, Nashik Road | 9403781999 | brighttutorials.in