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by aaronwall 5032 days ago
In some cases Google has reduced the organic search results to 7 listings per page. On some of the search results where Google has done that they have also added 3 AdWords ads at the top & the bottom of the organic search results.

The reason the prefer ads in the left column to the right is that is where most the attention goes & most of the clicks go. Ads at the top of the left column of the search results might get a 20% to 30% clickthrough rate (higher than that even on navigational search results...more like 90%+). And ads in the right column are lucky to get even a 1% CTR.