Two proofreaders were given the same manuscript to read. If proofreader 1 found n1 errors, and proofreader

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Two proofreaders were given the same manuscript to read. If proofreader 1 found n1 errors, and proofreader 2 found n2 errors, with n1,2 of these errors being found by both proofreaders, estimate N, the total number of errors that are in the manuscript

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