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Permutations , combinations and binomial expansion — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsPermutations , combinations and binomial expansion1 Mark
Question
What is ${ }^{ n } P _{ r }$ ?
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Answer

If $r$ distinct things out of n distinct things are to be arranged in $r$ different places, then total number of such arrangements is called ${ }^{ n } P _{ r }$ 

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