Question

Suppose there are 10 multiple choice questions in quiz. Each question has four possible answers, and only one of them is correct. What is the probability of having two correct answers if a student attempts to answer every question at random?

Answer 1

10c2*4c1
45*4
170

hope it helps ......

Answer 2

Total number of outcomes=(10*4)

                                            = 40

Number of favourable outcome= 10

So, P(getting a correct answer)=10/40

                                                   = 1/4

The probability of having 1 correct answer is 1/4

So, the probability of having 2 correct answer is (2*1/4)

                                                                                 = 1/2

(Ans): 1/2