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Straight lines are drawn by joining m po...

Straight lines are drawn by joining m points on a straight line to n points on another line. Then, excluding the given points, number of point of intersections of the lines drawn is (no two lines drawn are parallel and no three lines are concurrent)

A

`(1)/(4) mn (m-1) (n-1) `

B

`(1)/(2) mn(m-1) (n-1) `

C

`(1)/(2) m^(2) n^(2)`

D

`(1)/(4) m^(2)n^(2)`

Text Solution

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The correct Answer is:
B
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