I understand that there are only four more questions that he needs to answer correctly for him to past the test.I know the basic equation but I'm not sure what to do from there.
A student is writing a multiple choice test consisting of 40 questinons, each of witch provides 4 possible choices. He is certain that he has 16 questions correct. If he guesses for all of the remaining 24 questions, what is the probability that he will pass the test?
Hint: There are only 24 questions left to choose from.