cat6128539

shifeng310

look look

freeman6666

sad sad...cant ans

s79e08x06

一分钟就答出来了....

afeicom

easy！

megamo

1st divide them into 2 groups, 6 of each side. heavier side will be measured again. 2nd, tree of each side and then so the same thing. at least, three balls left. just weight any two. if one side is heavier then oyu know the answer. otherwise, if they have same weight, the one is not on the scale will be the special ball

tomwu007

i want to know

mjjb

thz, let's see

edric911

I think so easy!

mi2

let's see

ccc4040

it is difficult ...

sockeo69

求真理啊

ivan_van

let's see

gmb_0911

看看答案

zq99

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