i think that will be 4公仔箱論壇; c4 D) _" q% H' S/ Q% c5 V
if you list all the number from 1 to 10
y3 R2 m) k6 R' D7 i$ N% v5 yseperate them into 3 groups5 }' c+ M- k. u
from 1 to 4 has 2 numbers between them& E$ I, k/ i" I( n6 ^* m
from 4 to 7 has 2 numbers between them公仔箱論壇& s9 H9 U7 ^: \- M
from 7 to 10 has 2 numbers between them
6 g n, b2 {) A# i7 v; U- M8 H+ |so if you ask 1/3 of 10
5 g: o0 e) P3 x7 Bthat will be 4 |