Learn to Use Permutation Formula to solve Permutations & Combinations Problems. This tutorial will teach you to solve question by both way, first we learn by formula method and second we solve the same question by Fundamental Principle of Counting.
We use permutation formula -
P(n,r) = n!/(n-r)! to solve arrangement related questions and same question also be solved by old methods of solving permutations and combinations problems by Fundamental Principle of Counting numbers.
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