3 basic statistics questions

Q1.
2 doors, one of them has treasure behind it. what is the probability of
finding treasure behind door 2?

Q2.
3 doors, one of them has treasure behind it. Now if I already know door
1 has nothing behind it, what is the probability of finding treasure
behind door 2?

Q3.
a basket of mixed black/white balls. each time take two balls out of
the basket. If the two balls have identical color, put one white ball
in basket; else put one black ball in basket. at the end, will there be

1. no ball left
2. one white ball left
3. one black ball left
4. not sure.


C.

.

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