there are 4 boxes colored red,yellow,green and blue.if 2 boxes are selected , how many combination are there for atleast one green box or one red box to be selected?
a)1 b)6 c)9 d)5

• __ __ (two boxes)in one box R or G is to be placed so,2C1 and in remaining one box can be filled in 3C1 ways so ,total is =====2C1+3C1=5
• 11 years agoHelpfull: Yes(21) No(2)
• no of combinations with one green and no red=2
  no of combinations with one red and no green=2
  no of combinations with both red and green=1
  total no of combinations=2+2+1=5
• 11 years agoHelpfull: Yes(6) No(1)
• 4 boxes .and selecting 2...so its 4C2..AND ONLY 1 COMBINATION "BLUE AND YELLOE" IS EXCEPTIONAL.SO..(4C2)-1=5
• 11 years agoHelpfull: Yes(5) No(0)
• ans is 5
  ry
  rg
  rb
  gb
  gy
• 11 years agoHelpfull: Yes(1) No(0)
• ans s 6....
  4C2=6
• 11 years agoHelpfull: Yes(0) No(10)