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Question 9 - Figure it out - Page 143, 144 - Chapter 6 Class 7 - Number Play - Ganita Prakash
Last updated at October 17, 2025 by Teachoo
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 6 Class 7 - Number Play - Ganita Prakash
- Numbers can Tell us Things, Supercells
- Parity
- Figure it out - Page 131
- Small Squares in Grids (Parity in Multiplication)
- Parity of Expressions
- Some Explorations in Grids
- Magic Square
- Figure it out - Page 136
- Generalising 3 × 3 Magic Square
- First ever 4 × 4 Magic Square
- Magic Squares in History and Culture
- Virahāṅka Fibonacci Numbers
- Digits in Disguise
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Figure it out - Page 143, 144
Transcript
Question 9 What is the parity of the 20th term of the Virahāṅka sequence? Now, our Virahāṅka–Fibonacci sequence is 1, 2, 3, 5, 8, 13, 21, 34, … The sequence goes even, odd, odd, even, odd, odd, even, odd, odd, ... Lets write this term wise Term 2: Even (2) Term 3: Odd (3) Term 4: Odd (5) Term 5: Even (8) Term 6: Odd (13) Term 7: Odd (21) Term 8: Even (34) Thus, Term 7: Odd (21) Term 8: Even (34) Thus, we can say that 2nd term, 5th term, 8th term are even So, Terms which are even = 2, 5, 8, 11, 14, 17, 20, 23 Thus, 20th term will be even
