In an examination of 10 multiple choice question (1 or more can be correct out of 4 options). A student decides to mark the answer at random .Find the probability that he gets exactly questions correct.

In an entrance examinations there are multiple choice question. There are five possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 80%. IF he gets the correct answer to the question, then the probability that he was guessing is

In an entrance examinations there are multiple choice question. There are five possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 80%. IF he gets the correct answer to the question, then the probability that he was guessing is

In an examination there are 3 multiple choice questions and each question has 4 choices. Number of ways in which a student can fail to get all answers correct is

In an examination there are 3 multiple choice questions and each question has 4 choices. Number of ways in which a student can fail to get all Answers correct is

Each of five questions on a multiple choice examination has four choices, only one of which is correct. A student is attempting to guess the answer. If the random variable X is the number of questions answered correctly, the probability that the student will get exctly three answer correct is

In an examination there are three multiple choice questions and each question has 4 choices. Number of ways in which a student can find to get all answers correct is :