Assuming the question :P
the answer :
R_{AB}=\frac{\sqrt{7}-1}{3}a\rho
'a' is the side of the largest Δ and Ï the resistance per unit length
Assuming the question :P
the answer :
R_{AB}=\frac{\sqrt{7}-1}{3}a\rho
'a' is the side of the largest Δ and Ï the resistance per unit length
see eure i can give u a hint .The current distribution doesnt change if the terminals are interchanged.So u can apply connection removal method.
http://www.targetiit.com/iit-jee-forum/posts/resistance-9754.html
a slightly better version of the question