(a) Two diamonds are chosen at random. What is the probability that both diamonds are industrial-grade? (b) Four diamonds are chosen at random. What is the probability that all four diamonds are industrial-grade? (c) What is the probability that at least one of four randomly selected diamonds is gem-quality? Would it be unusual that at least one of four randomly selected diamonds is gem-quality? (a) Two diamonds are chosen at random. What is the probability that both diamonds are industrial-grade? The probability is (Round to four decimal places as needed.)

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