There are 600 business students in the PG department of a university, and the probability of any student to need a copy of a textbook from the university library on any day is 0.05; How do you calculate the no. of copies of the book to be kept in the university library so that the probability may be greater than 0.9 that none of the student needing a copy from the library has to come back disappointed?
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answer is 22/5
solution I will give you soon, wait for a while
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