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?

• 2 boxes can be chosen from 4 boxes in 4C2 ways=6 ways. now one yellow and 1 bluue can appear in 1 way
  so total ways =6-1=5
• 9 years agoHelpfull: Yes(8) No(1)
• let boxes be r,y,g,b respectively now
  combinations when g is choosen- g+r, g+y, g+b=3
  combinations when r is choosen - r+y, r+b=2
  so total combinations = 3+2=5
• 9 years agoHelpfull: Yes(4) No(2)
• In 4color 2has to be selected. So 4c2=6. One green 4c1=4 or one red 4c1=4. So (4+4)/6=8/6=4/3
• 9 years agoHelpfull: Yes(0) No(5)
• ans is-3/4
  we can calculate the probability of not getting red or green = only one case i.e yellow and blue
  1/4
  so probability of getting at least one red or one green=1-1/4=3/4
• 9 years agoHelpfull: Yes(0) No(2)
• 4c1/4c2 +4c1/4c2 =8/6 =4/3
• 9 years agoHelpfull: Yes(0) No(2)