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
  4C2-1=5
  
• 8 years agoHelpfull: Yes(8) No(1)
• 3*3-1=5
  3 bcz 3 com pf at least 1 g bal
  and 3 bcz 3 com pf at least 1 r bal
  -1 bz one combn havg both g r ball
• 8 years agoHelpfull: Yes(0) No(5)
• answer=5
  4c2-1=5
• 8 years agoHelpfull: Yes(0) No(0)
• given 4 boxes of 4 different colors and we have to choose two boxes out of these.
  
  so total number of combinations =4C2=6
  
  Combinations are - GB,GR,GY,BR,BY,RY
  
  So the combinations of at least 1 green ball =3
  
  the combination of at least 1 red ball =3
  
  total combinations =3+3–1=5 ( 1 combination deducted because GR was included in both sets of combination)
  
  so therefore there are 5 combinations for selecting at least 1 red ball or 1 green ball.
• 10 Months agoHelpfull: Yes(0) No(0)