Question: When I posted different answers to a question, some people seemed to frown upon it.

[Is $G/pG$ is a $p$-group?](https://math.stackexchange.com/questions/232526/is-g-pg-is-a-p-group)

Answer: 
One reason for preferring a single answer is given when you try to add another answer, which suggests *refining* and *improving* an existing answer.

The answers you gave are not especially distinct from one another. By combining them into a single answer, the relationships between them can be seen implicitly through juxtaposition -- or even better, it could be explained *explicitly*. The combined answer could easily be much more illuminating than three individual answers.

I imagine that the answers aren't especially distinct aggravated the negative reaction to multi-answering.
**Usual cases**

There is nothing wrong with giving multiple answers, as long as they are sufficiently different. However, it is customary to give them all in the same post, headed by a **bold title** and separated by a line `***`.

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**Exceptional cases**

If one of the answers is very long, it might be necessary to make an additional post, but that is a very exceptional case.