Given : let A , B and C be three students whose chances of solving a problem is given i.e ,
P(A) =
1
4
, P(B) =
1
5
and P(C) =
1
6
.
To Find: The probability that the problem is solved .
Here , P(the problem is solved) = 1 - P(the problem is not solved)
=
1
2
Therefore , The probability that the problem is solved is
1
2
.