When do I use aₙ = a·r^(n−1) in Sequences & Series, and what does it mean?
nth term of a geometric progression.
aₙ = a·r^(n−1) — nth term of a geometric progression. Use it when: constant ratio r. Always check the condition holds before plugging in numbers.
Key point
aₙ = a·r^(n−1)
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