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On a multiple-choice test, a student has four possible choices for each question. The student receives 1 point for a correct answer and loses point

On a multiple-choice test, a student has four possible choices for each question. The student receives 1 point for a correct answer and loses point for an incorrect answer.

If the student has no idea of the correct answer for a particular question and merely guesses, what is the student's expected gain or loss on the question?

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