The ratio P (S n = x)/P (Z n = x) is investigated for three cases: (a) when S n is a sum of 1-dependent non-negative integer-valued random variables (rvs), satisfying some moment conditions, and Z n is Poisson rv; (b) when S n is a statistic of 2-runs and Z n is negative binomial rv; and (c) when S n is statistic of N (1, 1)-events and Z n is a binomial r.v. We also consider the approximation of P (S n x) by Poisson distribution with parameter depending on x.