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i think that will be 4$ O2 E4 V. R3 _  r* T% Q4 p
if you list all the number from 1 to 10" c( M2 ?3 h/ v2 i
seperate them into 3 groups
& A  C% g" T6 s% H; C: z- s9 p0 Htvb now,tvbnow,bttvbfrom 1 to 4 has 2 numbers between them
7 M# B; t5 b& cfrom 4 to 7 has 2 numbers between them: }; y% }7 V, m" c
from 7 to 10 has 2 numbers between them
9 v6 ?& }7 q6 Mso if you ask 1/3 of 10
% J+ }0 ^$ v8 V  H, M5 \# K3 xthat will be 4
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