i think that will be 4
. F2 }3 v0 y( I% l7 Z公仔箱論壇if you list all the number from 1 to 10
& ?0 [* G0 R% F6 ]5 W* ~seperate them into 3 groups; t2 P$ S; ~. k5 O( h' ]
from 1 to 4 has 2 numbers between them
X9 ?' }+ y" Ttvb now,tvbnow,bttvbfrom 4 to 7 has 2 numbers between themtvb now,tvbnow,bttvb& @! C* k& A" Y9 G# H8 g; w
from 7 to 10 has 2 numbers between them
: |2 k W0 O8 U; \6 s8 N* J& htvb now,tvbnow,bttvbso if you ask 1/3 of 10
. W" ^6 n. n5 z: cthat will be 4 |