imo class 12 probability

An exam has true/false questions. A student guesses all 4 answers. Probability of exactly 3 correct answers is:

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An exam has true/false questions. A student guesses all 4 answers. Probability of exactly 3 correct answers is:

  • A. 1/4
  • B. 1/8
  • C. 3/8
  • D. 1/16

Answer: A) 1/4

Explanation: ⁴C₃(1/2)⁴=4/16=1/4.

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