24 random points. 7 are collinear. Any 3 points are not collinear.find the number of triangles formed.

• total = 24 points
  colinear points=7
  number of traingles can be formed=[ 24c3-7c3 = 1932-35 =1989 ].
• 10 years agoHelpfull: Yes(64) No(4)
• ans is 24c3-7c3
• 10 years agoHelpfull: Yes(6) No(1)
• sorry its 7c2 x 17c1 + 17c2 x 7c1 + 17C3
• 10 years agoHelpfull: Yes(6) No(1)
• 7c2 x 17c1 + 17c2 x 7c1
• 10 years agoHelpfull: Yes(4) No(7)
• to form triangle we need 3 non collinear points.... given that there are 24 random points... and of them 7 are collinear hence it can be 24c3-7c3 ( since 7 are collinear points )=1989
• 10 years agoHelpfull: Yes(4) No(0)
• to form triangle we need 3 non collinear points.... given that there are 24 random points... and of them 7 are collinear hence it can be 24c3-7 ( since 7 are collinear points )=2017
• 10 years agoHelpfull: Yes(3) No(7)
• 24c3-7c3=1989
• 10 years agoHelpfull: Yes(2) No(2)
• the answer is 24c3 bcz on a plane any way 2 points are always collinear.given no 3 points are collinear. hence to form a triangle we need 3 points which are not lying on straight line(3 non collinear but 2 can always be collinear).7 is given only to confuse us !
• 10 years agoHelpfull: Yes(1) No(1)
• ans is 24c3-7c3
• 10 years agoHelpfull: Yes(1) No(0)
• 24c3-7c3+7c2*17c1
• 10 years agoHelpfull: Yes(0) No(3)
• total points = 24
  Colinear point = 7
  number of tringles can be formed = 24c3-7c3 = 1932-35 = 1989
• 4 years agoHelpfull: Yes(0) No(0)