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7. Statistics show that 2% of laptops bought arrive broken. If two laptops are bought what is the probability that (i) they both arrive broken, (ii) only one laptop arrives broken, and (iii) neither laptop arrives broken? 8. A lecturer is marking a students computer code. It is found that 80% of the errors are spotted after reading the code once, but the remaining errors become harder to spot so that the proportion of errors spotted in any subsequent read is only half that of the preceding read. Find the probability that a given error in a code will not be spotted after 5 reads