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Logic Level 3

In an examination, there are three multiple choice questions and each question has 4 choices. Find the number of ways in which a student can fail to get all the answer correct.


The answer is 63.

Manya Singh by Manya Singh , 18, India

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2 solutions

Saya Suka
Mar 23, 2021

Answer
= 4³ - 1
= 63

1 Helpful 1 Interesting 1 Brilliant 0 Confused
Manya Singh
Sep 25, 2018

Since each question can be answered in 4 ways. So, the total number of ways answering 3 questions is (4 * 4 * 4 ) = 64. Out of these possible answers, only one will be correct, and hence the number of ways in which a student can fail to get all the answers correct is 64-1=63.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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