https://www.youtube.com/watch?v=Rpz5HCGAlNA&t=&loop=0
https://www.youtube.com/watch?v=GdWkzv__Xzg&loop=0
https://www.youtube.com/watch?v=Qz0FJ33W41U&loop=0
m
.d
.x
of ability of all population is (d+nm)/(1+n)
for n
be the number of population excluding the dragonx=d/2
, requires d/2=(d+nm)/(1+n)
↔(1+n)d=2d+2nm
←n≠1→ d=2m(n/(n-1))
↔d=2m(1+1/(n-1))
d<4m
the mean of other population is at least stronger than a quarter of a dragon.