摘要: We investigate the behaviour of P(R ≥ r) and ≤ - as r → ∞ for random variable R:= Formula math M k , where ((Q )) ∈ N is an independent, identically distributed sequence with P(-1 1) = 1. Random variables this type appear in insurance mathematics, solutions stochastic difference equations, analysis probabilistic algorithms elsewhere. Exponential Poissonian tail can arise.