The three glasses trick

Let's take three glasses.
I'll put them on the table, upside down or upright (two in the same position).

I'll turn them upside down two by two and in three times I'll put them back all the right way round.
Then it will be your turn. You will have to put them the right way round in three times too.
Shall we start ?

In the frame below, first click on Start.
Look at the demonstration very carefully, then click on Your turn.


CLICK the picture

A la nôtre !    


Explanation here


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