(c) 2016 Don Baker
Combinations of pickups don’t tell you how to connect them together. They only tell you how many you have to work with. This article, General Equations for Combinations of Humbucking Pairs, provides development and equations for:
Unique combinations of KK dual-coil humbucking pickups taken MM at a time, NKK,MM
Math 7: 
and Unique combinations of K match single-coil pickups taken M pairs at a time, SNK,M
Math 11: 