M. : Karapuz, 2010. — 20 c. This book from the Logic series will introduce your child to combinatorial tasks for very small ones. Smart people say that combinatorics, as a branch of mathematics, deals with the problems of selecting and placing elements of a certain set in accordance with the rules and restrictions. And even if your child does not become a mathematician, solving combinatorial problems will be useful to him. After all, many life situations require the ability to calculate all possible options and choose the best one taking into account all conditions. For example, to exchange a money bill, to decompose objects into piles, to calculate how many and what performers will be required to perform these, those and those works, and so on. d.