In the puzzle, /_\
/_\/_\
/_\/_\/_\ this is having 10
vertices, we are to find the no.of triangles which is 13 here
I tried to derive a general formula, but couldn't :(
What I understood was triangles have vertices as n(n+1)/2,
n=2,3,4,5..................
Also that the no. of triangles for k(k+1)/2 vertices is no.of
triangles in k(k-1)/2 + triangles of all sizes with atleast one
vertex in the larger triangle.
will be grateful if someone could give a fitting reply
Thanks in advance
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