The document "Combinatorial Rules and Permutations: Product and Sum Principles with Recursion" provides a comprehensive exploration of fundamental combinatorial principles, focusing on the Product Rule, Sum Rule, and various permutation concepts. This detailed guide is designed to aid students, edu...
SUM RULE
If r activities can be performed in n1, n2, …, nr ways and if they are disjoint, viz., cannot be
performed simultaneously, then any one of the r activities can be performed in (n1 + n2 + … + nr)
ways.
PERMUTATIONS WITH REPETITION
1) When repetition of n elements contained in a set is permitted in r-permutations, then the
number of r-permutations is 𝑛 .
Recursion Page 1
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