GCNU314A_NotesLecturer.docx - ITE3706/ITE3707 Foundation Mathematics II(A/II(B GCNU314A – Notes Unit Title Permutation and Combination 排列或組合

GCNU314A_NotesLecturer.docx - ITE3706/ITE3707 Foundation...

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ITE3706/ITE3707 Foundation Mathematics II(A)/II(B) GCNU314A – Notes Unit Title Permutation and Combination 排列或組合 Unit Code GCNU314A 1 Addition Rule of Counting If a task 工序 can be done by different methods, say, ; one of ways can be adopted in method 1, one of ways can be adopted in method 2, , one of ways can be adopted in method . Therefore, the total number of ways of getting the task done is . Example 1 Three brands, A, B and C of ice cream are sold in a supermarket. Brand A, Brand B and Brand C offer two, three and four flavours of ice cream respectively. What is the total number of choices of ice cream? Solution 2, 3, 4 Total number of choices 2 Multiplication Rule of Counting If a task can be done by steps, say, ; one of ways can be adopted in step 1, one of ways can be adopted in step 2, , one of ways can be adopted in step . Therefore, the total number of ways of getting the task done is . Example 2 If red, yellow, blue and green are four choices of colour of car exterior,
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