We continued section 2-6 in the Algebra book on Probability. Today's questions required a lot of thought, and therefore took a lot of time. Marcos had to find the size of the sample space of all positive 3 digit numbers. From there, he had to find the probability of finding different subsets of that sample space. Through trial, error, and a lot of counting, he was able to complete #33-39 on p. 97. He joked that the exercises hurt his head. I think they were adequately challenging for him.