A problem in maths is given to three students ,whose chances of solving are 1/3,1/4,1/5.what is the probability that:The problem is solvedOnly two can solveOnly one can solveAll of them can solveNo one can solve

Only 2 can solve...
Take 3 cases each with 2 sets of students who can solve the problem and one who will not be able to solve the question.
1/3.1/4.4/5+ ¼.1/5.2/3+ 1/3.1/5/3/4

For when only one can solve,
1/3.3/4.4/5+........

For all of them …
1/3.1/4.1/5

For none...
2/3.3/4.4/5