Q3. One day your friend decides to play a game. He pulls up three boxes of chocolates and tells you that one of them has Toblerone

Q3. One day your friend decides to play a game. He pulls up three boxes of chocolates and tells you that one of them has Toblerones in it, one has Ferrero Rochers in it, and the last one has both Toblerones and Ferrero Rochers in it. You can see that one of the boxes is marked “T” for Toblerones, another is marked “FR” for Ferrero Rochers, and the third is marked “T & FR” for both Toblerones and Ferrero Rochers. Your friend tells you that all three boxes are incorrectly marked. You get to pick one box, and your friend will pull a chocolate out of it and show you what it is. You get to do this only one time. After that, how can you determine-without a doubt-which box has Toblerones, which one has Ferrero Rochers, and which one has both? please explain​