There are 
points on a straight line 
and 
points on another line 
, none of them being the point 
. Triangles are formed from these points as vertices when (i) 
is excluded (ii) 
is included. Then the ratio of the number of triangles in the two cases is
Text Solution
Verified by ExpertsA
Case I : When 
is excluded.
Number of triangles = selection of 2 points from 
and one point from 
selection of one point from 
and two points from 
…..(i)
Case II : When 
is included.
The triangles with one vertex at 
selection of one point from 
and one point from 
.
Number of triangles
…..(ii)
Required ratio 
.
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