\input zb-basic \input zb-matheduc \iteman{ZMATH 2013d.00690} \itemau{Tlust\'y, Pavel; \v{S}t\v{e}p\'ankov\'a, Radka} \itemti{Generalisation of collector's problem.} \itemso{Billich, Martin (ed.), Mathematica IV. Proceedings of the Polish-Czech-Slovak mathematical conference, Catholic University Ru\v{z}omberok, Spi\v{s}sk\'a Kapitula, Slovakia, June 5--8, 2012. Ru\v{z}omberok: Verbum, Catholic University in Ru\v{z}omberok Press (ISBN 978-80-8084-954-2/pbk). Scientific Issues, 173-175 (2012).} \itemab Summary: The paper deals with a generalisation of the so called collector's problem, a known problem from probability theories, when we are interested either in: { indent=6mm\item{-} how many cards we should buy in order that an event with a given probability happens or \item{-} how many cards we have to buy on average to make a collection complete. } The generalisation is based on a more realistic background when we do not buy cards separately but in sets of several pieces. \itemrv{~} \itemcc{K50 K30} \itemut{probability; collector's problem; stochastic graph} \itemli{http://math.ku.sk/data/konferenciasub/CPSMC2012/Mathematica\_IV\_print\_2012.pdf} \end