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BNW is correct - in Campaign Mode, you can pretty much do anything as long as you're playing the whole AP. If you're just running the PFS-sanctioned sections as quasi-modules, then you'd need a minimum of 3 PCs and a legal Pre-Gen (which only exist at levels 1, 4, and 7 regardless of the book levels).
Technically, for campaign mode, you don't even need to use PFS numbers, although reluctant players might thank you for it later if they do indeed join PFS after the campaign is underway/over.