Probability

Three students S1,S2, and S3 are given a problem to solve. Consider the following events:
U : At least one of S1,S2, and S3 can solve the problem,
V : S1 can solve the problem, given that neither S2 nor S3 can solve the problem,
W:S2 can solve the problem and S3 cannot solve the problem,
T:S3 can solve the problem.
For any event E, let P(E) denote the probability of E. If
P(U)=‌

1

2

,P(V)=‌

1

10

,‌ and ‌P(W)=‌

1

12