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mathmath333
 one year ago
Count the number of triangles in the figure using permutation and combination
mathmath333
 one year ago
Count the number of triangles in the figure using permutation and combination

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mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0dw:1440958389425:dw

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0\(\large \color{black}{\begin{align} & \normalsize \text{Count the number of triangles in the figure using }\hspace{.33em}\\~\\ & \normalsize \text{ permutation and combination}\hspace{.33em}\\~\\ \end{align}}\)

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1I also got 28, but splitting it into permutations and combinations would be very messy! Hope someone would enlighten us on this!

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0yes counting manually is very easy

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0i doubt that there is a way P&C way

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1The worry is if there are many panels in both dimensions, then it would be messy if we're not systematic.

ChillOut
 one year ago
Best ResponseYou've already chosen the best response.0I can only split in two cases  I can't fit the smallest triangles in a case where a formula applies. :(

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1Yeah, then there are exterior and interior nodes, and the "invisible nodes" where the diagonal intersect... three sizes of triangles, we end up with about 9 or more cases!
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