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Ex 8.1, 3
Last updated at June 9, 2026 by Teachoo
Class 9
Chapter 8 - Predicting What Comes Next: Exploring Sequences & Progress
- 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
Ex 8.1, 3 Determine whether 97 and 172 are terms of the sequence π‘_π=5πβ3 "for " πβ₯1"." To check whether 97 and 172 are terms of sequence We put π‘_π = 97 and find n Checking if 97 is a term of sequence Given π‘_π=5πβ3 Putting π_π = 97 97 = 5n β 3 97 + 3 = 5n 100 = 5n 5n = 100 n = 100/5 n = 20 Thus, 97 is the 20th term of the sequence Checking if 172 is a term of sequence Given π‘_π=5πβ3 Putting π_π = 172 172 = 5n β 3 172 + 3 = 5n 175 = 5n 5n = 175 n = 175/5 n = 35 Thus, 172 is the 35th term of the sequence
