**A**

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

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