I studying for the final of my probability course. I am coping with a question. I cannot figure out any logic to answer it.
Let X be the number of questions asked to you and let Y be the number of questions you answered wrongly.
The probability that you answer a question independently wrong is 1/4.
You are asked 0, 1 or 2 questions.
I have a problem with the probability of X = 0 and Y = 0(Y = 1 and Y = 2 as well).