Question

Find the common ratio for the following sequence. 27, 9, 3, 1,

Answer 1

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Answer: /3 or :3
Why?
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The sequence here is decreasing, so it is either being subtracted or divided. This has a unit rate, so it looks like this. (27-x=9|9-x=3|3-x=1) It's not being subtracted, because x in the first equation shown above, (17) does not fit for 9 - x = 3, or 3 - x = 1. So it has to be divided by something. You find it by multiplying the first two numbers together. It looks like 1 * x = 3. Remember, any number times one is that number, so the answer is 3. Check: 27 / 3 = 9. That is correct. 9 / 3 = 3. This is also correct. 3 / 3 = 1. This also, is correct. So, your answer is 3.

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