How many servers for Sharepoint 2013?

We are a small IT firm and I want to spin up a SharePoint 2013 server.  One of our techs is saying that we need three servers to set up SharePoint 2013 the "way it's supposed to be".

I cannot find that in any documentation I have seen or read.  Of course, I could see if I already have an SQL server, just using it rather than spin up another one, but really?  Three servers?

Thoughts?
crp0499CEOAsked:
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amac81Commented:
If you put it into farm mode, you can run it all on one server, and eventually grow to something more.  If it is a small number of users and a light transactional load on the database, I don't see why you couldn't run it on one server.

Here's a technet about how to do it.

http://technet.microsoft.com/en-us/library/cc262243(v=office.15).aspx
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crp0499CEOAuthor Commented:
There will be less than 25 users.
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Walter CurtisSharePoint AEDCommented:
Additional, it's not just the size of the farm or number of users, but the value of the access to the data that should help you make this decision. Do you know data redundancy? Do you need 24/7/365 access? Take these factors in to consideration. Although a single server farm it technically possible, is it enough?

Hope that helps
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