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A publishing company hires two proofreaders, Al and Betsy, to read a manuscript. Al finds 48...

A publishing company hires two proofreaders, Al and Betsy, to read a manuscript. Al finds 48 errors and Betsy finds 42 errors. The editor finds that 30 common errors were found by the proofreaders; that is, 30 errors were found by both Al and Betsy. What is your estimate of the number of errors not yet found? (Billstein, et al)

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