@ARTICLE {, title = {Pravdepodobnostné počítadlo}, author = {Lendelová, Katarína}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2003}, volume = {32}, number = {1}, pages = {1--11}, issn = {1335-4981}, abstract = {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.}, }