(n-2 C p)+ 2(n-2 C p-1) +(n-2 C p-2) = (n C p)
#combinations
fallen totem
polar nacelleBOT
(n-2 C p)+ 2(n-2 C p-1) +(n-2 C p-2) = (n C p)
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maiden island
(n-2 C p)+ 2(n-2 C p-1) +(n-2 C p-2) = (n C p)
i guess
expand it out write everything in terms of (n-2)! and (p-2)!
maybe something happens idk
covert wolf
It's Pascal's identity applied twice
fallen totem
+close