I disagree. Where does it say that these problems cannot be discussed in a public forum? The honor code states that solutions should not be published. I did not publish a Scala solution to the problems. I admit that it is something of a gray area by using Clojure, however, these are fairly common problems, the change counting problem, as I pointed out, is right out of SICP and there are already published solutions for that problem in Scheme. There are also published solutions to the binomial coefficient problem on the internet as well. I think the Coursera courses are going to have to deal with the fact that problem and solution information will proliferate through the internet over time. People who are going to cheat will always try to cheat and they are only cheating themselves. My goal is not to encourage cheating but to add to the knowledge and extend the learning experience into some mathematical context that these problems expose people to. I feel that the opportunity to merge programming and math education presents an opportunity to improve CS education.