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A classroom contains 8 students. A student committee of 3 (president, vice-president, and treasurer) must be selected. Harry Potter will serve only as president and

A classroom contains 8 students. A student committee of 3 (president, vice-president, and treasurer) must be selected. Harry Potter will serve only as president and only if either of his friends Ron Weasley or Hermione Granger serves as vice president; otherwise, he leaves the group. The others (including Ron and Hermione) have no such restrictions. What is the probability that Ron or Hermione become the president of this group? Report the answer to 3 decimal places.

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