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It is possible for a computer to pick up an erroneous signal that does not show up as an error on the screen. The error is called a silent error. A particular terminal is defective and when using the system word processor it introduces a silent paging error with probability .1. The word processor is used 20 times during a given week.

(a) Find the probability that no silent paging errors occur.

(b) Find the probability that at least one such error occurs.

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Category:- Statistics and Probability
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