[bemusedthrow75]

> Without additional assumptions this original wording is not clear

The only problem you are being asked to solve is the one described only in the words of the problem.

That's actually what this is all about. This is a learning exercise, not just about probability, but about comprehension of what the problem as described exactly says.

That's what makes it so enormously valuable.

[jncfhnb]

If you’re literally following the words then you cannot solve the problem. There is no information gain.