which of the following is not a good practice when writing an outline?
separate unlike ideas in an outline.
number the topics and details of your outline.
make the more important items your general topics.
mix topics, sentences, and paragraphs in an outline.

The answer is: Mix topics, sentences, and paragraphs in an outline.

Explanation:

An outline should be organized and neat, listing supporting ideas and major points is a must. It should give you the essential features of something, but not in detail, this is the reason why the three first options aren't possible, as them three need to be included. As it should be organized and concise; mixing topics and "paragraphs" in an outline is the worst practice you could do.

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