Geometric Sequences
Multiply by same number each time.
\(n\text{th term} = ar^{n - 1}\)
Example
2, 4, 8, 16,... has common ratio 2.
→ nth term = 2 × \(2^{n - 1}\)
Practice
What is the 5th term of 3, 6, 12, 24, ...?
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