Permutations And Combinations - Mathematics ALEVEL, Exercises of Mathematics

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PERMUTATIONS AND COMBINATIONS - ALEVEL

PERMUTATIONS AND COMBINATIONS - ALEVEL CHAPTER 2: PERMUTATIONS & COMBINATIONS. In this topic, you will learn about: 4 Arrangement ina line Termyrahons Ton items our Oo nm hems. When items are distinct When items are not distinct. When there are restrictions When repetitions are allowed v viv Permutations of r items from n items 4 Combinations of r items from n items >» When n items are distinct > When n items are not distinct Probability involving permutations and combinations ARRANGEMENT IN A LINE When items are distinet = When we have n different items and we would like to arrange all of them in a line, we will use nl = The formula as follows: lo = Ye 3x axl 2% 3X 2K1 Example 2.1: How many dif ferent arrangement are there if 3 students sitting ona bench? Solution: feo 31 = Bxax\ 26 ac 8 Bae @ca eae ec BA