#reading-9-probability-concepts
The number of ways to choose r objects from a total of n objects, when the order in which the r objects are listed does matter, is
nPr=n!(n−r)!nPr=n!(n−r)!
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Summary he combination formula. The number of ways to choose r objects from a total of n objects, when the order in which the robjects are listed does not matter, is
nCr=(nr)=n!(n−r)!r!nCr=(nr)=n!(n−r)!r!
<span>The number of ways to choose r objects from a total of n objects, when the order in which the r objects are listed does matter, is
nPr=n!(n−r)!nPr=n!(n−r)!
This expression is the permutation formula.
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