3-person Problem: how can three people write on the same worksheet without seeing each other’s answers on the worksheet? Rules: they are not allowed to make copies of the worksheet.  Their only materials are any color of cellophane sheets and any color of markers.  They can write only directly on the paper. The way they do it should be in the spirit of the 2-person example described below. 2-person Example: we have figured out how two people can use the same worksheet without seeing each other’s answers. The way we did that was that the first person would use a red … Continue reading Challenge #1: Three people write on one worksheet