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experimentXBest ResponseYou've already chosen the best response.5
let's see, we have 1 huge triangle
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
the no of smallest triangle is 9+7+5+3+1 = 26
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
a little bigger triangle .. we have 13, so total is 40 until now
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
no .. but quite close
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
Oo... sorry @King 's right i made mistake in above summation
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
can you explain your approach?
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
9+7+5+3+1 = 26 .. from this i was able to deduce 46
 2 years ago

KingBest ResponseYou've already chosen the best response.2
nos.of small triangles=25 not 26!!@experimentX
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
still i cannot come up with general formula ...!
 2 years ago

KingBest ResponseYou've already chosen the best response.2
no.of triangles=level of @experimentX
 2 years ago

DiyadiyaBest ResponseYou've already chosen the best response.0
Wait letme count again
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
lol ... quite a matching no.
 2 years ago

KingBest ResponseYou've already chosen the best response.2
no.of small triangles=25 no.of triangles with 2 rows of small triangles=10 no.of triangles with 3 rows of small triangles=6 no.of triangles with 4 rows of small triangles=3 1 big full triangle so, 25+10+6+3+1 =45!!
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
no.of triangles with 2 rows of small triangles=10 ...it think this should be 13, aren't we missing inverted triangles?
 2 years ago

.Sam.Best ResponseYou've already chosen the best response.0
If overlapping I found 45
 2 years ago

CallistoBest ResponseYou've already chosen the best response.0
not include the inverted ones :(
 2 years ago

KingBest ResponseYou've already chosen the best response.2
there are no inverted ones wid 3 or 4 rows so it has to be 48...i think
 2 years ago

KingBest ResponseYou've already chosen the best response.2
@experimentX u der?if u are happy and satisfied wid answer close the question....
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
i guess 48 is the right answer ...
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
still i was looking some sorts of permutations and combinations to this get this answer ... anyway thanks to all who tried.
 2 years ago

philips13Best ResponseYou've already chosen the best response.0
floor(n(n+2)(2n+1)/8) where n is the number of triangles on a side in your specific case, n=5
 2 years ago

TuringTestBest ResponseYou've already chosen the best response.0
if this problem is only about the dark triangles it is kind of boring... isn't it about using the inverted ones as well as callisto suggested?
 2 years ago

TuringTestBest ResponseYou've already chosen the best response.0
actually, I'm seeing more problems with the solution here isn't there much more going on that we are ignoring?
 2 years ago

FoolForMathBest ResponseYou've already chosen the best response.1
@philips13 Gave the right answer. \[\huge \lfloor \normalsize \frac{ (n(n+2)(2n+1)}8 \huge \rfloor \]
 2 years ago

TuringTestBest ResponseYou've already chosen the best response.0
Oh yeah? Ok thanks, but now I wanna decipher it you seem to be familiar with this theorem FFM :P
 2 years ago

FoolForMathBest ResponseYou've already chosen the best response.1
I am familiar with almost everything labelled interesting :P http://www.mathematik.unibielefeld.de/~sillke/SEQUENCES/gridtriangles
 2 years ago

TuringTestBest ResponseYou've already chosen the best response.0
You think we haven't noticed? Where do you get this encyclopedic knowledge?!
 2 years ago

FoolForMathBest ResponseYou've already chosen the best response.1
Lol, I was kidding. I am just an ordinary guy with some practice :)
 2 years ago

TuringTestBest ResponseYou've already chosen the best response.0
yeah, whatever... :P I'm not sure I understand some of the notation on the link you gave me, but I'm sure I'll get it after hacking away at it for a while. Thanks :D
 2 years ago

CallistoBest ResponseYou've already chosen the best response.0
I was thinking why i couldn't get the answer 48 when i did the calculation. But then from the website, it says that number of triangle = n*(n+2)*(2n+1)/8 for n even = (n*(n+2)*(2n+1)  1)/8 for n odd So, I got 48 finally... BTW, it's experimentX who first suggested that we were missing the inverted triangles
 2 years ago

experimentXBest ResponseYou've already chosen the best response.5
thanks to all for reply!! and finally it's complete!
 2 years ago
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