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Permutations and Combinations | Math | Class 11

1,513 views · Published 19 September 2018 · 5:59 · Indexed 25 September 2026

Channel: Aasoka · 2018 · Education

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Permutation and Factorial Notation
In this module, you will learn about the permutation and factorial notation.

• Permutation is an arrangement of all the objects with regard to the order of the
  arrangement.
For example:
Suppose, we have a set of vowels: a, i, e, o, u. We might ask in how many ways
can we arrange them?
Case 1: Repetition of letters not allowed.
5x4x3x2x1 = 120 ways
Case 2: Repetition of letters is allowed.
5x5x5x5x5 = 3125 ways

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