google adsense in muliple blogs ..

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i want to know what happens if i put google adsense in multiple sites..? if i put one adsense in one site and when someone clicks a link i will get some money right.. but what whould happen if i put multiple google adsense in multiple sites..? will i get less money when someone clicks the same link..? i think u guys understand my question.. please help me if you know the process.. thank you