(Given by Tom)

You have two equal crystal balls for which we know that when dropped from a building with 100 floors will break. You just don’t know which is the first floor from where the balls will break.

To find out the floor you can go to the first floor, drop one of the balls, and if it doesn’t break you go to the second floor and try again, until the limit is found. Having 2 balls, how can you minimize the maximal number of tries until the limit is found?

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