You have two coconuts and you want to find out how high they can be dropped from a 100 story building before they break. Now, the elevator in this building costs a quarter to operate-meaning you want to minimize the number of trips you must take. So how many trips would it take at most to figure out how far the coconuts can fall? Bear in mind the coconuts are identical; they’ll break at the same point. Also, if they don’t break, they’re considered as good as new.

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