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A classroom contains 9 students. A student committee of 3 (president, vice-president, and treasurer) must be...

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Statistics

A classroom contains 9 students. A student committee of 3(president, vice-president, and treasurer) must be selected. HarryPotter will serve only as president and only if either of hisfriends Ron Weasley or Hermione Granger serve as vice president;otherwise he leaves the group. The others (including Ron andHermione) have no such restrictions. What is the probability thatRon or Hermione become the president of this group?

The answer is not 0.25

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