Geometric progression
Find a term in a sequence with a constant ratio.
Inputs
Use the units shown—
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Formula & explanation
aₙ = arⁿ⁻¹
Variables & units
- First term
- Numeric value · minimum -1000000000, maximum 1000000000
- Common ratio
- Numeric value · minimum -1000000000, maximum 1000000000
- Term number
- Numeric value · minimum 1, maximum 1000
Worked example
2, 6, 18, … has its 5th term at 162.
Assumptions
Multiply by the ratio n − 1 times. Extremely large sequences may exceed numeric limits.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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