Question

6 In a puzzle contest, there are 8 objective
questions. Each question has 4 choices of
answers and there is only one correct answer.
If a participant guesses an answer at random,
find the probability that he/she could guess
correctly
(a) all the 8 questions,
(b) not more than 2 questions,
(c) at least 3 questions.​

Answer 1

Answer:

Step-by-step explanation:

There are 4 choices for each question. So, there

are 4 ways to answer a question.

Number of ways to answer 3 questions

=4×4×4

     ↓     ↓     ↓

1  

st

 question 2  

nd

  3  

rd

 

=64

Out of 64 ways there is only one way which has

all the answers correct.  

So, Number of ways in which a student can fail to get all answers

correct =64−1

            =63

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