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Combining Google AdSense ads and third-party ads, it will mean more targeted ads will display on AdSense publishers sites. But, will the third-party ads help publishers make more money online? You wouldn't know until you test them. But, Google believes that they will result in increased revenue for many AdSense publishers.
If you like to optimize your site to display third-party ads, you may visit Google AdSense blog here and follow the instructions posted.