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A straight line AB has m point on it another straight line AC has n points on it find the number of triangle by joining these points whose one vertex is A?

A straight line AB has m  point on it another straight line AC has n points on it find the number of triangle by joining these points whose one vertex is A?

Grade:12th pass

1 Answers

saransh
31 Points
6 years ago
this is a simple question on probalility.,
the line AB has m-1 points left as A is one of the points hat lie on the line AB ,similarly line AC has n-1 points left on it,
not the number of possible triangles = the different no of ways we can pick a point on line AB multilpied by the same on AC ,which is equal to,
 
C1m-1 × Cn-1

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