In a book of $500$ pages,it is found that there are $250$ typing errors. Assume that Poisson law holds for the number of errors per page. Then,the probability that a random sample of $2$ pages will contain no error,is :
- A$e^{-0.3}$
- B$e^{-0.5}$
- C$e^{-1}$
- D$e^{-2}$
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