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Exercise Question 2 (Page 176)
Last updated at June 9, 2026 by Teachoo
Class 9
Chapter 8 - Predicting What Comes Next: Exploring Sequences & Progress
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Definition
- Explicit Rule for a Sequence
- Recursive Rule for a Sequence
- VirahΔnkaβFibonacci sequence
- Exercise Set 8.1
- Arithmetic Progressions
- Visualising an AP
- Sum of the First n Natural Numbers
- Exercise Set 8.2
- Geometric Progressions
- Fractals as a GP Sequence
- Visualising a GP
- Exercise Set 8.3
- End-of-Chapter Exercises
Transcript
Exercise Question 2 (Page 176) Can you write π‘_5, π‘_6, π‘_7 and π‘_8 for the sequence of triangular numbers? Our Triangular Numbers are 1, 3, 6, 10, 15, β¦ The pattern here is Difference between terms keeps increasing by 1. We add 2, then add 3, then add 4, then add 5, and so on Here, 5th term = π_π = 15 6th term = π_π = 15 + 6 = 21 7th term = π_π = 21 + 7 = 28 8th term = π_π = 28 + 8 = 36
