牧龙在野!

A woman applies for two jobs, job A and job B. She thinks that she has 60% chance of getting job A and a 50% chance of getting job B. She also thinks that if she gets A, then the chance of her getting B increases to 70%.

Required:
1. Find the probability that she will get one job exactly;
2. Find the probability that she will get both jobs.
3. Find the probability that she will get job A if she knows already that she has get job B.

作者：zhanghongbiao@牧龙在野!
地址：http://www.mlzy.net/Probability-problems/
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