Four multiple-choice questions are randomly selected (that is, each time is regarded as 25%), and the probabilities of one, two and three questions in the four questions are all right and all wrong re

Four multiple-choice questions are randomly selected (that is, each time is regarded as 25%), and the probabilities of one, two and three questions in the four questions are all right and all wrong respectively. The probability of a match among the four questions is c (4,1) * 0.25 * (1-0.25) 3 = 4 * 0.25 * 0.753 = 27/64.

The probability c (4 4,2) * 0.252 * (1-0.25) 2 = 6 * 0.252 * 0.752 = 27/128.

The probability of three of the four questions is c (4 4,3) * 0.253 * (1-0.25) = 4 * 0.253 * 0.75 = 3/64.

The probability of all pairs in the four questions is 0.25 4 = 1/256.

The probability of all right and wrong in the four questions is (1-0.25) 4 = 8 1/256.