Step 1:

Total number of questions to be answered is $\"\"$ .

Number of choices to be made for correct answer is $\"\"$ .

Let $\"image\"$ be the probability of selecting correct answers.

Probability of selecting correct answer from each question is

$\"image\"$

$\"\"$ \ \

Let $\"image\"$ be the probability of correctly answering four questions.

Probability of answering $\"\"$ questions is

$\"\"$

Solution:

The probability of correctly answering four questions is $\"\"$ .