- #1
mtayab1994
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Homework Statement
Let there be 2 boxes U1 and U2. Box U1 contains 3 red balls and 4 black balls. Box U2 contains 5 red balls and 3 black balls.
We chose at random from one of the boxes:
-If it's a red ball from U1 we put it in U2.
-If it's a black ball from U1 we put 2 black balls in U2.
-If it's any ball from U2 we place 3 red balls in U1.
And then we chose at random from the other box.
1) Count the probability of the event A that the first ball is red.
2) What is the probability of the event B that the second ball is red.
3) What is the probability that both balls are red.
4) What is the probability of choosing a red ball on the first try while knowing that the second one is red.
5) Are the events A and B independent.
The Attempt at a Solution
After making my tree i got the following:
1)59/112
2)41/70
3)37/112
4)59/112
5) The events A and B are independent because: [tex]P_{B}(A)=P(A)=\frac{59}{112}[/tex]
Is that correct guys?