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1. Three men and two women are candidates for two vacancies. A selector can choose two candidates. In how many ways can he make his selection?

Answer: 10

2. How many different ways can two books be chosen from 10 books, if two particular books are to never be chosen?

Answer:28

And one general question: Is there any good resourse for learning probability. To me seeing one question here and there with solution does not work. I need solid source to study from. Any advise is appreciated.