In an examination, a candidate has to pass in each of the four subjects. In how many ways can he fail?
Explanation for the correct option:
Finding the number of ways the student can fail:
In an examination, a student can either pass or fail.
So, the total number of ways in which one can pass or fail the examination
To pass an examination, a candidate has to pass in each of the four subjects. So, the number of ways in which the exam can be passed
Therefore, the number of ways the student can fail
Hence. option A is correct.