We will try to guess the proportion of balls of each color in each urn. We don't know the number of balls or colors. To guess the composition you have to make extractions and write down the results, and analyze the relationship between them: if there is the same number of balls of each colour, one doubles the other,...[br]Calculating the proportions, you should estimate the theoretical probability. A minimum number of extractions has been set that can be varied so that the result is not revealed the first time. There is a sheet that you can use in class for the students.[br]

- Extractions are made and the results are noted[br]- When we believe that we can deduce the probability, we write it on the sheet[br]- We repeat the process with other urns[br]- We collect information from other students or groups