TY - JOUR T1 - Pravdepodobnostné počítadlo A1 - Lendelová, Katarína JA - Obzory matematiky, fyziky a informatiky Y1 - 2003 VL - 32 IS - 1 SP - 1 EP - 11 SN - 1335-4981 N2 - The aim of this contribution is to introduce the probabilistic abacus as a medium for the motivation of high school students and as an instrument for a simple calculation of probability. We present a way, how the probabilistic abacus works, we calculate probability of events and the mean value without using infinite series. ER -