Residents telephone for a plumber

Reference no: EM131832797

Consider a town in which there are 3 plumbers; on a certain day 4 residents telephone for a plumber. If each resident selects a plumber at random from the telephone directory, what is the probability that (i) all plumbers will be telephoned, (ii) exactly 1 plumber will be telephoned?

Reference no: EM131832797

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