The seal at the bottom of the tank is leaking. Usually the call this a flapper. Take the top off the tank and look directly to the bottom of the tank in the center. Flush the stool and you will see the flapper rise and then fall. You probably need to replace the flapper. To do this just turn the water off to the stool, flush it to get all the water out of the tank, reach your hand in the tank and disconnect the flapper and now you can take it to most hardware stores and get another one.
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