There are 4 boxes colored red, yellow, green and blue. If 2 boxes are selected, how many combinations are there for at least one green box or one red box to be selected?

• ans is 5
  combinations of the 4 boxes like
  red, yellow
  red,green
  red,blue
  yellow,green
  green,blue
• 7 years agoHelpfull: Yes(3) No(0)
• 2 boxes from 4 boxes can be selected in 4C2 ways
  
  Neither green nor red box can be selected in 2C2 ways.
  Atleast one green box and one red box can be selected in 4C2-2C2 ways
  Ans.5
• 6 years agoHelpfull: Yes(1) No(0)