THERE ARE 10 POINTS IN A PLANE AND 6 POINTS ARE ON STRAIGHT LINE FIND 1. HOW MANY STRAIGHT LINE CAN BE FORMED? 2. HOW MANY TRIANGLES CAN BE FORMED?

Asked by SHRUTI GUPTA | 19th Oct, 2013, 03:14: PM

Expert Answer:

(1) 
Hence, total lines = 10C2 - 6C2 + 1
 
(2) We know that any triangle can be obtained by joining any three points not on the same straight line.
So, number of triangles = 10C3 - 6C3

Answered by  | 19th Oct, 2013, 07:17: PM

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