permutation
একটি সমতলে 15 টি বিন্দু আছে ।এদের মধ্যে 5 টি বিন্দু একই সরলরেখায় অবস্থিত ।অপর যে কোন 3 টি বিন্দু সমরেখ নয় ।বিন্দুগুলো যোগ করে মোট কয়টি সরলরেখা পাওয়া যাবে?
- nishat protyasha
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Re: permutation
আমার মনে হয় 96 টি সরলরেখা পাওয়া যাবে।
- Fatin Farhan
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Re: permutation
C(15,2)-C(5,2)+1.
Last edited by Fatin Farhan on Wed Oct 02, 2013 8:20 am, edited 1 time in total.
"The box said 'Requires Windows XP or better'. So I installed L$$i$$nux...:p"
- nishat protyasha
- Posts:33
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Re: permutation
@ Fatin
I think, the answer is C(10,2)+(5*10)+1= 96.But my answer has not matched with yours.
I think, the answer is C(10,2)+(5*10)+1= 96.But my answer has not matched with yours.
- Fatin Farhan
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Re: permutation
I forgot to add 1.
"The box said 'Requires Windows XP or better'. So I installed L$$i$$nux...:p"
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Re: permutation
Based on the same situation, how many triangles can be formed?