i think that will be 4! T7 g9 B. [, ^; }9 F
if you list all the number from 1 to 10
. a( _- z* s7 P" o4 K公仔箱論壇seperate them into 3 groups8 w* c; S; u b$ k8 R4 \
from 1 to 4 has 2 numbers between themtvb now,tvbnow,bttvb- a7 k# w% e2 D( W
from 4 to 7 has 2 numbers between them
' U; ?1 y8 z3 e# v# A; Q公仔箱論壇from 7 to 10 has 2 numbers between them* f" l+ D6 r' I5 m/ I4 ?
so if you ask 1/3 of 10( \ x5 s5 H! [) u, v: J+ S, B
that will be 4 |