Combinations and permutation in mathematics are the various ways through which a set of items can be organized. Mathematicians have deduced that these number arrangements can be found using factorials. For example, an n number of items can be arranged in n! different ways. So the number of combinations with 6 numbers can be found using this formula.
n!=n × (n-1) × (n-2) × … 1. Here n= 6
Therefore, there will be 6 x 5 x 4 x 3 x 2 x 1 = 720 different combinations