A bookshelf contains 20 textbooks for different subjects

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A bookshelf contains 20 textbooks for different subjects. Among those, 10 of them are used ones, and 10 of them are brand new. You select 2 books and sell one at a time on Oct 11, and Oct 12. Find the probability that the book you will sell on Oct 11 is used one given that the book you will sell on Oct 12 is brand new.

Reference no: EM13645283

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