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Permutation

What is Permutation?

In Wikipedia:

In  mathematics , the notion of permutation relates to the act of arranging all the members of a  set  into some  sequence  or  order , or if the set is already ordered, rearranging (reordering) its elements, a process called permuting.

Simple Definition:

Permutation is an arrangement of all part of a set of objects.

(No other Explanation)

Example:

MATHEMATICS

n=11 (11 letters in MATHEMATICS)

r1 = 2(M)

r2 = 2(A)

r3 = 2(T)

(11!) / (2! 2! 2!) = 4989600