Riddles, brain puzzles and mathematical problems

[BAndrew]

My first guess was

P(Σ)= P(A) + P(B) + P( C ) + P(D) + P(E) =
1/3 + 1/3 + 1/3 + 1/3 + 1/3 = 5/3

But I doubt it's that simple.

ERM NO It's a possibility over 100%

Another thought was

(1/3) * (1/3) (1/3) * (1/3) * (1/3) = 1/243 which is approximately 0,004115 ~ 0,4115%
which makes more sense.
But I haven't been taught about probabilities at school so I am not sure.