This is a fantastic easy prediction trick based on simple mathematics. No sleight is needed. It's
best to use 3 people but it can also work with one person. The good thing is that you can easily
arrange to have a different prediction each time you perform. However, that's probably not necessary
since you would only need to perform this once. This can be performed any time n your routine. It
will have a puzzling magical effect on spectators! Highly recommended.