There are \[m\] points on a straight line \[AB\] and \[n\] points on another line \[AC\], none of them being the point \[A\]. Triangles are formed from these points as vertices when (i) \[A\]is excluded (ii) \[A\] is included. Then the ratio of the number of triangles in the two cases is

There are \[m\] points on a straight line \[AB\] and \[n\] points on a

1.	There are \[m\] points on a straight line \[AB\] and \[n\] points on another line \[AC\], none of them being the point \[A\]. Triangles are formed from these points as vertices when (i) \[A\]is excluded (ii) \[A\] is included. Then the ratio of the number of triangles in the two cases is
A.	\[\frac{m+n-2}{m+n}\]
B.	\[\frac{m+n-2}{2}\]
C.	\[\frac{m+n-2}{m+n+2}\]
D.	None of these
Answer» B. \[\frac{m+n-2}{2}\]

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There are \[m\] points on a straight line \[AB\] and \[n\] points on another line \[AC\], none of them being the point \[A\]. Triangles are formed from these points as vertices when (i) \[A\]is excluded (ii) \[A\] is included. Then the ratio of the number of triangles in the two cases is

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