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Question 2

menu_bookSolutionmenu_bookTheorymenu_book•(i) If3C2:nC2=15:1{}^3C_2 : {}^nC_2 = 15 : 13C2​:nC2​=15:1, find $n$.menu_book•(ii) IfnPr=120{}^nP_r = 120nPr​=120and ${}^nC_r = 20$, find $r$.
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11TH · MATH

Question 2

menu_bookSolutionmenu_bookTheorymenu_book•(i) If3C2:nC2=15:1{}^3C_2 : {}^nC_2 = 15 : 13C2​:nC2​=15:1, find $n$.menu_book•(ii) IfnPr=120{}^nP_r = 120nPr​=120and ${}^nC_r = 20$, find $r$.
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Accedmychevron_right11thchevron_rightmathchevron_rightPermutations And Combinationschevron_rightExercise 7.4

See detailed working.

Answer: (computed)

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