Jannis from Northcross Intermediate said:"I think Kaia was right. The ties come out of the closet randomly. We know each tie has 1 eighth of a chance to be pulled out, so its quite likely that the father will not wear 1 tie twices in the week. But its random so there is a chance of him wearing a tie twice in the week."
Making the point that they're probabilities so you can't be sure.
Matthew and James from Stradbroke Primary did an experiment, and found that they picked the same tie twice in 9 out of 10 weeks. Ege and Onur from FMV Ozel Erenkoy Isik Primary School, Turkey, also did experiments, and you can find their results here and here .
Some people have tried to calculate the probability of picking the same tie twice, but none correctly yet. Here is what happened when we tried the experiment: