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-

Answer: Option D

Number of ways of attempting 1^st, 2^nd, 3^rd 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