Hello, I read "Google AdSense Program Policies" but i can not find anything against putting two of the same ad type in one page. But i would like to ask this to you since it is becoming very time consuming to re-change some changes in my site. Is two ads with the same type (specifically Large Rectangle (336x280)) allowed in one page? (There will be a link unit at the left.) Thanks.
They can be any size, and color that google provides, as long as no more than three instances of the code are present on one file.
The two answers above didn't directly respond to your question. The answer is: yes. You are allowed to have up two three ads of the same type on you page.
So what your saying is you could have like 3x 728x90 adsense units, 3x 468x60 adsense units etc on any one page? That's news to me if so. From my understanding it's just 3 instances of the adsense code on any given page. Having just checked out the policies, I think you may be mistaken dude. From the Adsense policies, it says: Which I'm sure you would assume means 3 adsense units in total, regardless of how you display the ads.
Right, you can have up to 3 ad units on any page. These 3 ad units can all be of the same type if you wish. Or they can be of different types. Sorry if my explanation wasn't clear.