Probabilistic Event

She is a professor of probability and firmly believes that everything can be explained by numbers, except that she does not believe in fate. She has failed on 99 blind dates, and her friends said it was a "low probability event". For the 100th time, the other person was half an hour late and she was about to leave when the man came running over with sweat on his face, holding a book she wrote in his hand and said, "I have been looking for this book for three years." She was stunned - it was her most unpopular academic work, and the printing company only printed 500 copies. She closed her notebook and smiled for the first time on a blind date. Later she said that the probability of meeting you was one in a million, but this book was the question I miscalculated.