The probability that a student X solves a problem in dynamics is `2/5` and the probability that student Y solves the same problem is `1/4`. What is the probability that: the problem is not solved.

The probability that a student is not a swimmer is 1/5 . Then the probability that out of five students, four are swimmers is

The odds against student X solving a stats problem are 8:6 and odds in favour of student Y solving the same problem are 14:16 . Find the chance that: The problem will be solved if they try independently.

The odds against student X solving a stats problem are 8:6 and odds in favour of student Y solving the same problem are 14:16 . Find the chance that: Neither of them solves the problem.