Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

This week’s question is below. Get out their scrap paper and start solving!

{8, 10, 11, 16, 20, 22, 25, x}

In the set above, x is an odd integer between 13 and 21, inclusive. Each possible x value is equally probable.

Which of the following statements has the highest probability of being true?

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