I teach 11 to 15 years old and this post make me think of something I encountered this year.

My question was : Alice wants to choose randomly an integer from 1 to 10 (both included). She only has one coin. Write a way for her to do it.

It was the first time I asked this question in years of teaching. Few found a valid answer and it was always a variation of four toss and ignore 6 possibilities.

I asked myself, is there a more elegant way but didn’t think of one.

If someone does, I’m going to elaborate on that question this year with various dices. ]]>

You are right, I fixed it.

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