once i permanently delete a blogger blog from my blogger account then what happen after 90 days , can anyone again be able to register same blogger address or that same blogger url address wil be availble for register or not

Yes, after 90 days of permanently deleting a Blogger blog, anyone can register the same Blogger address. The blog's URL will be available for registration again.

When you permanently delete a Blogger blog, it is removed from Google's servers and all of its content is lost. However, the blog's URL is not deleted immediately. It is kept in a holding period for 90 days, during which time you can restore the blog if you change your mind. After 90 days, the blog's URL is released and can be registered by anyone.

If you are concerned about someone else registering your blog's URL after you delete it, you can purchase a custom domain name for your blog. A custom domain name is a unique address that you own, such as www.example.com. Once you purchase a custom domain name, you can point it to your Blogger blog. This way, even if someone else registers your Blogger blog's URL, you will still be able to access your blog at your custom domain name.

Here are the steps on how to permanently delete a Blogger blog:

1. Go to your Blogger dashboard.
2. Click on the blog that you want to delete.
3. Click on the Settings tab.
4. Scroll down to the "Manage Blog" section and click on "Remove your blog."
5. Click on the "Delete" button.
6. Click on the "Permanently delete" button.

Once you have permanently deleted your blog, it will be removed from Google's servers and its URL will be released for registration after 90 days.