Barisal Secondary 2013 / 9
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Please don't post problems (by starting a topic) in the "X: Solved" forums. Those forums are only for showcasing the problems for the convenience of the users. You can always post the problems in the main Divisional Math Olympiad forum. Later we shall move that topic with proper formatting, and post in the resource section.
From the $16$ lattice points of the $3*3$ grid, you have to choose $6$ so that at least three of them are either collinear or they form a right triangle. In how many ways can this be done?
Last edited by *Mahi* on Tue Jan 14, 2014 3:00 pm, edited 1 time in total.
Reason: Fixed typing or printing mistakes.
Reason: Fixed typing or printing mistakes.
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"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
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Re: Barisal Secondary 2013 / 9
Show the solution Labib bhai.