i think that will be 4
0 u4 v7 k) t& a& @4 [1 I3 pif you list all the number from 1 to 10公仔箱論壇: J) |3 x& q, J+ S- b, x
seperate them into 3 groups/ P7 u7 v7 T+ J, d
from 1 to 4 has 2 numbers between them9 ?+ Z* _( P, D
from 4 to 7 has 2 numbers between them _5 z2 _9 w: ?" a' R" r. o
from 7 to 10 has 2 numbers between themtvb now,tvbnow,bttvb, v5 H9 _% b/ E) c- i! p
so if you ask 1/3 of 10% R+ ~, |$ d5 }
that will be 4 |