how many Allowed Adsense ad units on a Website Page?

Allowed Adsense ad 3 units on a Web Page....

Maximum of 3 content unit. Content unit are available in following sizes:


Adsense ad units - 728 X 90
Adsense ad units - 250 X 250
Adsense ad units - 300 X 250
Adsense ad units - 336 X 280
Adsense ad units - 160 X 600
Adsense ad units - 468 X 60
Adsense ad units - 234 X 60
Adsense ad units - 125 X 125
Adsense ad units - 120 X 600
Adsense ad units - 180 X 150
Adsense ad units - 120 X 240
Adsense ad units - 200 X 200


Good suggestion :- I have seen 728 X 90 and 336 X 280 to be very effective. Anyways, Every one can use ads from multiple pub-id but total no. of content display ad should not go beyond 3.
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