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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
Write the mathematical relationship between permutation and combination in usual notations.
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Answer

In usual notations the mathematical relationship between permutation and combination is : ${ }^n P_r=:{ }^n C_r . r!$

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