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Is it possible to draw a 5-pointed star without taking your pencil off the paper?
Is it possible to draw a $6$-pointed star in the same way without taking your pen off? Remember that you shouldn't join points that are right next to each other and you can't go over the same line twice. Your lines must run straight from one point of the star to another.
Have a go:
What about $7$-pointed and $8$-pointed stars?
Do you think you'll be able to draw a $9$-pointed star without taking your pencil off? Why?