i think that will be 4公仔箱論壇$ |% F8 \* ~/ i! h
if you list all the number from 1 to 10
$ g" L; b9 V- m, @ B# w' v1 p& iseperate them into 3 groups5.39.217.77* l$ F3 A8 p5 T* K" k C, a3 Z
from 1 to 4 has 2 numbers between them
. N+ S& P, c& _' W2 {4 Wfrom 4 to 7 has 2 numbers between them公仔箱論壇4 Z& R% k5 `+ b4 X
from 7 to 10 has 2 numbers between them5.39.217.772 N" \ s. z- q
so if you ask 1/3 of 10公仔箱論壇. R7 h$ @. T3 o4 D+ \
that will be 4 |