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Employees of company X are offered a health plan by an insurer

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Employees of company X are offered a health plan by an insurer. as part of this plan, the individual employees are given a choice: either they may choose exactly two of the supplementary coverages A, B and C, or they may choose no supplementary coverage. the proportions of the company's employees that choose coverages A, B and C are 1/4, 1/3, 5/12 respectively. Find the probability that a randomly chosen employee will choose no supplementary coverage