Solution:
Each question can be answered in 4 ways and all
questions can be answered correctly in only one way.
So, the required number .
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
Each question can be answered in 4 ways and all
questions can be answered correctly in only one way.
So, the required number .