In an examination, there are 3 multiple choice questions and each question has 4 choices. If a student randomly selects answer for all the 3 questions, what is the probability that the student will not answer all the 3 questions correctly ?

Options

A. `1//64`
B. `63//64`
C. `1//12`
D. `11//12`

Answer

B

Explanation

Since, probability of answering all the three questions correctly `= 1/4 xx 1/4 xx 1/4 = 1/64`
`therefore` Probability of not answering all the three questions correctly = `1 - 1/64 = 63/64`