A space rocket has a device consisting of four units A₁, A₂, A₂, A₁, each of which fails to operate when at least one elementary particle hits it. The failure of the entire device occurs either if A, fails or if A₂, A, and A, fail simultaneously. 46 04 0.3 FIGURE 10 0.1 Construct the distribution function F(x) of the random number of elementary particles X, for which the entire device will fail if the probability that a particle reaching the device will hit A, is p = 0.4, and the probabilities for hitting A₂. A, and A₁, are, respectively. Pa PaP = 0.2. RA

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