You won't be able to. Blocking usually means they don't want you to see their content, including snap stories. It's a way for them to have privacy from you.
In most cases, no. When you're deleted by someone, it's likely that their stories are no longer visible to you. This is a common privacy feature in many social media platforms.
I'm not quite sure what you mean by'must story'. Maybe if you clarify, I could help better. But generally, it depends on the platform and its settings.
Well, typically not. Unadding someone is like taking away their 'privileged' access to your content. For instance, on Snapchat, if you unadd a friend, they won't be able to view your story in the normal way. But, if you have a public story and it gets shared around a lot, they might see it in a more general sense, but it's not the same as if they were still on your friend list and seeing it as a regular follower.
Yes, muting someone usually only affects whether you receive notifications from them or see their posts in your feed. It doesn't prevent them from seeing your story.