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Since the shots are independent, the probability can be calculated by the formula (I.25):

To calculate the probability of the target damage with dependent shots, the approximate methods of calculation are usually used, in which the dependence of shots is either ignored or taken into account approximately. One of the simplest methods of taking into account the dependence of the shots is to calculate the probability of damaging the target using the approximate formula

(I.26)

where – the probability of target damage at one and n independent shots, respectively; μ – correlation ratio of shots (see I.16).

The relative error of determining the probability of damaging the target with this method at nW₁ ≈ 0.5–5 does not exceed several percents.