i think that will be 4# \% b- x9 P6 x' O0 X
if you list all the number from 1 to 10
/ U. `. o$ {1 @& Pseperate them into 3 groups
0 B5 c5 B- K& I+ }$ K' u5.39.217.76from 1 to 4 has 2 numbers between them
) a! c+ v8 m P7 I2 N$ [5.39.217.76from 4 to 7 has 2 numbers between them
( V7 g& A' e; m- z+ X$ w1 X! l, kfrom 7 to 10 has 2 numbers between them! J" S2 {. B/ m; t! |0 m, Q
so if you ask 1/3 of 10公仔箱論壇1 E- `; _1 Y1 S, ]( p
that will be 4 |