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Arithmetic vs Geometric

Directions: Which is bigger?

The common ratio, r, in a geometric sequence with


the common difference, d, in an arithmetic sequence with



How do you find the common ratio/common difference?

Can you tell just by looking at the given information?  Why or why not?



r = 4 and d = 5, so the common difference in this case is bigger.

Source: Nanette Johnson

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One comment

  1. It is interesting to see the importance of subscript notation here. CCSS generally show function notation for sequences, and rightly so, because sequences are functions. However, I think it would be much messier to write this question without subscript notation.

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