divde the 12 balls into 3 sets of 4. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。1 p$ r A- p- L5 R. @( G+ [" V
weight any 2 sets.' n# e; ?6 S! b$ R1 [
if the 2 sets are equal, then you know the heavy one is in the third
9 \3 c! A8 a9 s; F6 i% ? I0 qif one of the 2 is heavier, then the heavy one is in that set
( R" @4 z5 V6 b/ c2 Zthen divide the 4 balls into 2.tvb now,tvbnow,bttvb; m/ A# b" o, W) ~2 x# z& i, C0 z
weigh them
) L( j1 T0 W" T, H- F4 u5.39.217.77and divide the heavier into 1
: T4 ]5 v; q$ j3 G% E$ v! R/ ]" Yand weight them.tvb now,tvbnow,bttvb( W# W- A. y, i% R" ~
3 x weighing and get the ans. 4 @' b0 @. ]$ {" _
in less than 15 secs. |