ABSTRACT
Each of the preceding studies led us to expect the same conclusion: that the formation of the ideas of chance and probability depend in a very strict manner on the evolution of combinatoric operations themselves. It is from the ability to conceive mixture and interferences according to an operative scheme of permutations and combinations that the child comes to what is properly called the notion of random mixture, that is, to the notion of chance. On the other hand, the child constructs his notions of probability by his ability to subordinate the disjunctions effected within mixed sets to all the possible combinations, using a multiplicative and not simply an additive mode.
