Making different sidebar widget combinations show on different pages and posts

Hi

I wondered if there is a way to make different sidebar combinations of widget show on different pages and posts. so for example

page1 has a) subscribe widget, b) ad1, c) google adsense, d) trending post

but

post1 has a) subscribe widget, b) ad2 c) google adsense, d) text info e) rss feed links

Thanks and look forward to hearing back.
B/R Martha