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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