# Geometric progression

If the 6th term of a GP is four and the 10th is 4/81, find common ratio r.

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- geometric progression
- expression of a variable from the formula
**arithmetic**- cube root
- exponentiation
**numbers**- fractions

#### Units of physical quantities:

#### Grade of the word problem:

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