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An exam consists of 3 prboles selected r...

An exam consists of 3 prboles selected randomly from a collection of 10 prboles. For a student to pass, he needs to solve correctly at least two of three problems. If the student knows to solve exactly 5 problems, then the probability that the students pass the exam is

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An exam consists of 3 problems selected randomly from a collection of 10 problems. For a student to pass, he needs to solve correctly at least two of three problems. If the student knows to solve exactly 5 problems, then the probability that the students pass the exam is

An exam consists of 3 problems selected randomly from a collection of 10 problems. For a student to pass, he needs to solve correctly at least two of three problems. If the student knows to solve exactly 5 problems, then the probability that the students pass the exam is

In a class of 10 student, probability of exactly i students passing an examination is directly proportional to i^(2). If a student is selected at random, then the probability that he has passed the examination is

The probability to pass in an examination of mathematics for three students are 1/4,1/5,1/6 . Find the probability that at least two students will pass in this examination.

The probability to pass in an examination of mathematics for three students are 1/4,1/5,1/6 . Find the probability that at least two students will pass in this examination.

The student A, B,C solve the problem, their chances of solving are 1/2, 1/3, 1/4 then the probability that the problem is solved by exactly one of them is