In a book of 500 pages , it is found tha...

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 contains no error is

`e^(-0.3)`

`e^(-0.5)`

`e^(-1)`

`e^(-2)`

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