Question

Bernice takes a multiple-choice test, each question having 4 choices. If Bernice has no idea of any answer and simply guesses, find the probability that she gets all the questions correct if the test has 1 question, 2 questions, 3 questions 4 questions

Answer 1

We want to find the probability that Berenice gets all the answers correct.

1 question:

Each question has 4 options, each option has the same probability of being the correct option, so she has a 25% of randomly selecting the correct option.

Then the probability here will just be equal to the number of correct options (1) over the total number of options (4)

p = 1/4

2 questions:

We already know the probability for one question, then the probability of getting two questions correct will be equal to the product of the individual probabilities for each question:

p = (1/4)*(1/4 = 1/16

3 questions:

Similar approach as before:

p = (1/4)*(1/4)*(1/4) = 1/64

4 questions:

p =  (1/4)*(1/4)*(1/4)*(1/4) = 1/256

If you want to learn more, you can read:

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