Some people ask about Placing Third party advertisements with google adsense.Here what google says about third party advertisement:
Can I place Google ads on the same page with other ads?
You’re welcome to display Google ads on the same site or page as other third party advertisements provided that the formatting or colors of the third party ads is different enough from that of the Google ads. In other words, if you choose to place non-Google ads on the same site or page as Google ads, it should always be clear to the user that the ads are served by different advertising networks and that the non-Google ads have no association with Google. If the formats are naturally similar, we ask that you choose different color schemes for the competing ads.
Our intent with this policy is to be as fair to our advertisers as possible and to maintain the integrity of the AdWords and AdSense
Here Is the Link of the page : Third party Advertisement
As long as third party advertisement Format is different from google adsense, they have no problem with it. So Have fun with Google ads on the same page with other ads.