Paper 1 · Sequences and Series
⏱ Tested in 2 exam questions since 2018
Lesson 10 of 15
Sequences and Series 7: Geometric Sequences 3
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- Derive Tₙ = ar⁽ⁿ⁻¹⁾ by spotting the pattern in successive terms
- Find a and r from two given terms by substitution — divide the equations to remove a
- Take cube or fifth roots to extract r (e.g. r³ = 27/8 ⟹ r = 3/2)
- Divide by a fraction by flipping it and multiplying (8 ÷ 3/2 = 8 × 2/3)
Most recent exam questions
- 2024 P1 Q5(b)
- 2018 P1 Q9(b)(i)
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