How will you answer the last part in this question?

Mathematics
Tutor: None Selected Time limit: 1 Day

I am trying to understand how to approach that last question, how do I start answering such a question?

May 10th, 2015

where is the last question???????????

May 10th, 2015

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May 10th, 2015
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May 10th, 2015
Mar 26th, 2017
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