0580/22 Oct/Nov 2024, Question 20: Exponential Sequences
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 2 marks
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The question, in short
Work out a formula giving the nth term of the sequence 1/7, 1, 7, 49, 343, 2401, ...
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Solution · 2 marks
- 1The terms are powers of 7: 7⁻¹, 7⁰, 7¹, 7², …
- 2The power is 2 less than n
- 3nth term = 7ⁿ⁻²
Answer7ⁿ⁻²
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