board has a small center circle called the bull's-eye and 20 pie-shaped regions numbered from 1 to 20. Each of the pie-shaped regions is further divided into three parts such that a person throwing a dart that lands on a specified number scores the value of the number, double the number, or triple the number, depending on which of the three parts the dart falls. If a person hits the bull's-eye with probability 0.01. hits a double with probability 0.10, hits a triple with probability 0.05, and misses the dart, board with probability 0.02, what is the probability that 7 throws will result in no bull's eyes, no triples, a double twice, and a complete miss once?

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