1. A method of determining a result of an electronic game in order to allow fixed odds betting on the result, the method comprising: providing a mechanical ball draw machine configured to draw one ball at a time from a set of balls; providing a set of balls to said mechanical ball machine, said set of balls consisting of a plurality of subsets of one or more balls, at least some of the subsets having different numbers of balls and each ball being identifiable as belonging to a subset, whereby the relative numbers of balls in the subsets determine the likelihood of a ball from a subset being drawn thus allowing fixed odds betting to be carried out on a result determined on the basis of subset identity; drawing a ball or balls using said mechanical ball machine until sufficient balls have been drawn to enable a result to be determined; identifying the subset to which each said ball or balls belongs; and determining the result of said electronic game from the identified subset or subsets.