Interpretation of sum to infinity 2015 question

Some students interpret the following question (2015 paper 2, 4 biii) wrongly.

question

In the examiner’s report, it was commented that “most were able to state or imply the sum to infinity correctly, but some did not interpret correctly the phrase ‘within 10−3 of the sum to infinity.”

interpret

Examples of correct interpretation from past Cambridge papers

Example 1

percentage

Correct interpretation

1981

Example 2

88

 

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