In an examination there are three multiple choice questions and each question has 4 choices. The number of ways in which a student can fail to get all answer correct is-
Options:
A . 11
B . 27
C . 12
D . 63
Answer: Option D Number of ways of attempting 1st, 2nd, 3rd question are each. Total number of ways 43 = 4 × 4 × 4 = 64 Number of ways, getting correct answers = 13 = 1 ∴ Number of ways of not getting all answer correct = 64 - 1 = 63
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