Enyedy, N., Vahey, P., & Gifford, B. (1998). “…It’s fair because they each have two”: The Development of a Mathematical Practice Across Two Social Contexts. Proceedings of The Third International Conference on the Learning Sciences. Georgia Tech, Atlanta.
Excerpt
They have an equal chance of landing on…tails [R types] We think the game is fair because it has an equal chance of landing on heads as it has on tails.