Chapter 3 - Probability - Exercises 3.112 - 3.137 - Understanding the Principles - Page 151: 3.113

If there are N objects and n objects are taken from it to make n arrangements, then permutation will be given by NPn. For example if there are three objects x,y & z and we wish to take 2 at a time, then there will be 3P2 permutations, thus 3P2 = 3! / (3-2)! = 6

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