how many adsense per page?

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hi, I just wondering, how many google adsense can be placed on 1 page. I placed 1 adsense on side bar and 1 on each post on my blog. But it seems that the sidebar does not appear. Also, the adsense on each post only appear for the first 3 posts. But if you click on the post, the adsense work as normal. You may view it here: http://afirozia.110mb.com/blog/ Advice welcomed! regards, aerobrain