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how many triangles are possible using above points?

• 15C3 - 5*3C3 - 3*5C3 = 420
• 9 years agoHelpfull: Yes(5) No(2)
• 15C3 =455
  them their are 3 rows and 5 column i.e:455-43=412
• 8 years agoHelpfull: Yes(5) No(1)
• 15C3 = 455
• 9 years agoHelpfull: Yes(4) No(5)
• total no. of possible triangles=15c3
  in row 5 points are in straight line and in column 3 points are in straight line.
  so ans=15C3-3*5C3-5*3C3=420
• 9 years agoHelpfull: Yes(2) No(1)
• 15C3 - (3*5C3) -(5*3C3) - 6=414
• 8 years agoHelpfull: Yes(2) No(0)
• there are 15 points so the number of possible triangles are 15C3=455
• 9 years agoHelpfull: Yes(0) No(4)
• 394
  455-(5+50+6)
  
• 8 years agoHelpfull: Yes(0) No(0)
• guys it should be 414 @sangita dutta you made correct approach but there was calculation mistake..:)
  
• 8 years agoHelpfull: Yes(0) No(0)
• I think the ans is 414
  out of 455 chances we cannot make triangle in 36 ways so 455-36=419
  3+3 chances in diagonal
  10+10+10 in Straight line Like . . . . . any 3 points from this five cannot from triangle so 5c3 *3
  1+1+1+1+1 for . there are 5 chances that cannot make triangle
  so 414 chances we can make triangle
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• 8 years agoHelpfull: Yes(0) No(0)