1i already derived it eureka........see nishants sirs post
Similar to qeustion posted here http://www.targetiit.com/iit-jee-forum/posts/simple-puzzle-11129.html by Nishant sir
Q
I dont want u to calculate no. of triangles..instead derive a general formula for it[1]
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4 Answers
1check this out
http://www.mathforum.org/library/drmath/view/54894.html
24hmm actually formula is a lot simpler....
if u can derive it then it would be good.....otherwise i will post it after some time