for numbers m,n let G(m,n) denote a rectangular grid of mn dots with m rows and n columns
for eg G(3,4) IS AS
. . . .
. . . .
. . . .

what is the number of distinct rectangles in G(6,3)..EACH RECTANGLE SHOULD HAVE ITS VERTICES AMONG THE DOTS AND ITS SIDES SHOULD BE VERTICAL OR HORIZONTAL

• Number of rectangles will be 6C2*3C2 = 15*3=45
• 12 years agoHelpfull: Yes(8) No(2)
• You have to choose two parallel lines in horizontal direction and 2 parrallel lines in vertical direction to get a rectangle.
  Here we are having 6 parallel lines in horizontal direction and 3 parallel lines in vertical direction.
• 12 years agoHelpfull: Yes(8) No(0)
• 6C2*3C2 = 15*3=45
  6C2 = 6!/((6-2)!*2!)= 6!/(4!*2!)= 6*5/2=15
  3C2= 3!/(2!*1!)= 3*2/2=3
  
• 12 years agoHelpfull: Yes(2) No(0)
• is the answer m*m+n*n??
• 12 years agoHelpfull: Yes(1) No(3)
• i didnt got what is C2
• 12 years agoHelpfull: Yes(0) No(1)
• that i also know garima..hw come u got 15*3
• 12 years agoHelpfull: Yes(0) No(1)
• 13 rectangles
• 11 years agoHelpfull: Yes(0) No(1)
• 19 rectangles
• 11 years agoHelpfull: Yes(0) No(0)