Question

Which of the following are geometric sequences? Check all that apply. A. 10, 5, 2.5, 1.25, 0.625, 0.3125 B. 5, 10, 20, 40, 80, 160 C. 3, 6, 9, 12 ,15, 18 D. 1, 3, 9, 27, 81

Answer 1

The options that are geometric progressions are:

• D. 1, 3, 9, 27, 81
• A. 10, 5, 2.5, 1.25, 0.625, 0.3125
• B. 5, 10, 20, 40, 80, 160

What is a geometric progression?

This is a progression of numbers which usually have a defined ratio that is between them.

The ratio in the options above are:

$\frac{1}{2} , \frac{3}{1} , \frac{2}{1}$

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