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Sum of an Infinite Series

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We chattedĀ on twitter about this question for a bit. What predictions can you make about the predictions that were made? Click through to check your answers!

 

Here are the results from the 59 students who answered this question on an exam:

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How would you give feedback to the students who wrote “infinity”?

Imagine that you were to give feedback to the students who wrote “-3/7.” What feedback would you give?