A student is given 6 questions in a true or false examination If he gets 4 or more correct answers he passes the examination.The probability that he passes the examination is

A student has appeared for an examination. There are 20 question in the paper, with four multiple answer. If he answers correctly he gets 4 marks and if the answer is wrong he gets - 1 mark. A Student will pass in the examination if he gets 50% of the marks.If a student answers by sheer guessing, then the probability that he will pass in the examination is

A student is given a quiz with 10 true or false question, and he answers by sheer guessing. If X is the number of question answered correctly. If the student passes the quiz by getting 7 or maximum correct answer, then the probability that the student passes the quiz 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

The probability that a student passes at least in one of the three examinations A,B,C is 0.75, the probability that he passes in atleast two of the exams is 0.5 and the proabability he passes exactly two of the exams is 0.4 . If alpha,beta, gamma , are respectively the probabilities of the student passing in A,B,C then.