Maths probability (dependent events)?

1)Bag A contains 3 red balls and 2 white balls. Bag B contains 2 red balls and 4 white balls. An item is randomly taken from bag A and put into bag B.Then an item is randomly taken from bag B.Find the probability that one red ball is taken from bag B. 2) 50 students joined the test in the class.30 of... 顯示更多 1)Bag A contains 3 red balls and 2 white balls. Bag B contains 2 red balls and 4 white balls.
An item is randomly taken from bag A and put into bag B.Then an item is randomly taken from bag B.Find the probability that one red ball is taken from bag B.

2) 50 students joined the test in the class.30 of them passed the test. Two students are randomly chosen from the class .Find the probability that
a) only one of the two students chosen passed the test.
b) at most one of the two students chosen does not pass.
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