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Let L be a regular language over {0, 1}. Show how we can use the previous...

Let L be a regular language over {0, 1}. Show how we can use the previous result to show that in order to determine whether or not L is empty, we need only test at most 2n − 1 strings.

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I can't seem to get what is the previous result. Please check the question from the source and if any part is missing then mention it in the comment section. I would be glad to help you out here.

I wrote this so that you can get the answer to this question ASAP because most of the experts skip this type of question and you will wonder why no one is answering and won't know the cause.

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