In an examination there are three multiple choice questions and each question has 4 choices. Number of ways in which a student can fail to get all answers correct, is

In an examination there are three multiple choice questions and each question has 4 choices. Number of ways in which a student can fail to get all answers correct, is

  1. A

    11

  2. B

    12

  3. C

    27

  4. D

    63

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    Solution:

    Each question can be answered in 4 ways and all

    questions can be answered correctly in only one way.

    So, the required number =43-1=63.

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