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    Maths Platter
    Mar 09

    What is Factorial?

    in Concepts Permutation & Comb...


    Learn what is Factorial in Permutation and Combinations

    Learning Objective:

    • What is Factorial?

    • What is n x (n - 1)!


    Concept:

    • The product of 'n' natural numbers is called factorial.

    • For example if we multiply first 5 natural numbers, we obtain 5 factorial and if we multiply first 10 natural numbers, we obtain 10 factorial.

    • Factorial is denoted as "!". So the product of n natural numbers is n! (read as n factorial).

    1. For example 1 x 2 x 3 .....n = n!

    2. For example (Reverse Order) n x (n-1) x (n-2) ..... x 3 x 2 x 1 = n!

    3. For example 1 x 2 x 3 x 4 x 5 = 5!

    4. For example (Reverse Order) 5 x 4 x 3 x 2 x 1 = 5!

    5. For example 1 x 2 x 3 x 4 x 5 x 6 = 6!

    6. For example (Reverse Order) 6 x 5 x 4 x 3 x 2 x 1 = 6!