There are 4 balls and 4 boxes of colours yellow, pink, red and green. Red ball is in a box whose colour is same as that of the ball in a yellow box. Red box has green ball. In which box you find the yellow ball?

• Yellow box can have either of pink/yellow balls.
  if we put a yellow ball in "yellow" box then it wud imply that "yellow" is also the colour of the box which has the red
  ball(becoz acordin 2 d question,d box of the red ball n the ball in the yellow box have same colour)
  thus this possibility is ruled out...
  therefore the ball in yellow box must be pink,hence the colour of box containin red ball is also pink....
  =>the box colour left out is "green",,,which is alloted to the only box left,,,the one which has yellow ball..
• 11 years agoHelpfull: Yes(12) No(0)
• in red box =green ball
  r ball box col = y box
  if i put green ball in red box then ball then ball of yellow box should be green bt green ball is in red box.
  so red ball should be in pink box, pink ball in yellow box and yellow ball in green box .
• 5 years agoHelpfull: Yes(0) No(0)
• initially Red colour box has green box
  so lets say red ball is in a box whose colour is blue so now blue ball is in yellow box and now only one ball and one box is left i.e., yellow ball and green box ..therefore the yellow ball is in green colour box.
  draw the box and apply this you can find it easy..
• 5 years agoHelpfull: Yes(0) No(0)