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Solution   Find the probability of selecting workers from at least two different shifts. The probability that the selected 6 workers are from at least two different shifts means that the selected 6 workers can be from exactly 2 different shifts or from 3 different shifts. This probability can be calculated by subtracting the probability that all workers from exactly one shift from 1. \begin{aligned} P\left(\begin{array}{rl}\text { Selected worksers are from } \\ \text { at least two different shifis }\end{array}\right) & =1-P\left(\begin{array}{l}\text { Selected workes are from } \\ 1 \text { shift from any of the } 3 \text { shifis }\end{array}\right) \\ & =1-0.0054 \\ & =0.9946\end{aligned} Therefore, the probability of selecting workers from at least two different shifts is 0.9946. ...