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Question
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 answer correct is ______.
Options
11
12
27
63
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Solution
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 answer correct is 63.
Explanation:
There are three multiple choice question, each has four possible answers.
Therefore, the total number of possible answers will be 4 × 4 × 4 = 64.
Out of these possible answer only one will be correct
Hence the number of ways in which a student can fail to get correct answer is 64 – 1 = 63.
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