15 dots are given in 3 rows and 5 columns..i.e.,it is a 3*5 matrix of dots..how many triangles can be formed??

• 15c3-(5c3*3+1)=424
• 9 years agoHelpfull: Yes(8) No(1)
• 15c3-(3x5c3+5x3c3)=
  
  455-(30+5)=420
• 9 years agoHelpfull: Yes(3) No(1)
• Not understand plz explain in details
• 9 years agoHelpfull: Yes(2) No(1)
• How come it be 15C3? If someone selects three consecutive dots from d same row or column?
• 9 years agoHelpfull: Yes(1) No(1)
• 15C3-(5c3)*3- 5=420
  Here 5 Come by > 5 Columns with three dots
  And 3 rows with 5 points gives middle part
  
  It is right answer
  
• 9 years agoHelpfull: Yes(1) No(0)
• any three among them can form one triangle so, it may be 15c3...
• 9 years agoHelpfull: Yes(0) No(2)
• no.of triangles formed = 15c3
• 9 years agoHelpfull: Yes(0) No(3)