Can I use more than 1 SEO plugin for a wordpress site?

I have All in one SEO Pack,Platinum SEO&WP SEO Pro plugin all installed.
I am confused as to whether I should be using all these same purpose SEO plugin in my 1 site.
Or should I just use 1 among these plugins and not try to risk myself.
I recenly had my All in SEO plugin not work for some reasons, I thought its because I already had WPSEO plugin installed.
Waiting to know the right answer from the experts.
Thanks

Some plugins conflict with each other, so I'd suggest sticking with one plugin.

I've tried multiple seo plugins before but and at times conflict with theme/and other plugins.

maybe they dont have conflict but imho totally useless to use more than one plugin...your page wont more optimized becouse of them

Stick to one mate. ''All in one SEO Pack'' but that's just my opinion.