Variations theory

Variations   Variations is to group elements, when it matters the order, we do not take all the items and these can be repeated or not. Thus the variations may be:   Variations without repetition […]


Permutations Theory

Permutations   Permutations are multiplicative events where the number of possibilities is decreasing and whether it is important the order of a permutation, it is an arrangement of a set of objects in a defined […]

Ignacio   Combinatorics