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發表於 2007-3-2 12:35 AM
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分3組4隻波子秤
5 J5 t7 n k7 k# x3 t* {- K7 T0 u; M! @& I6 S, q* H: o
Group A: 1,2,3,4
6 a W0 I3 K% i q( {Group B: 5,6,7,8- `7 u8 J+ f2 l6 W" R7 E
Group C: 9,10,11,125 I( ?5 P( Y/ \
Group D: 133 f3 q, N! m7 b# Z* ^+ B" |
! E7 k3 U- Q( G% FRound 18 z L: ^6 v2 f$ w
Group A vs Group B/ M+ `1 E8 M+ w) s
如A and B一樣, 即較輕一粒在Group C or D- W: T* o# E. t" m( [1 g
( G' E- Y+ ]) S7 f4 z, c0 c h& iRound 2
5 A! ?! z$ X: ~4 v再在Group C拆成:. \4 `* u8 [2 ?! \
Group Ca: 9,10+ ^/ [! E J. H; L; s5 p; A
Group Cb: 11,12! W3 J/ R9 G+ E& U& z( n& a9 ? ^
然後再秤, 如一樣, 即13為較輕一粒.0 D4 X1 s+ S3 C0 t% v
1 \: x S! K a% m' j
如不同, 即較輕一組有一粒較輕波子在其中,
( m% j. k& j/ k* z" T& x要再秤, Round 3, 之後便知答案.2 r9 @( G' e- R' `2 F- _2 P7 Q
& D6 x& V: `: p" E, ]6 L
e.g. #1 假設10為較輕的一粒
3 X7 ~$ Q& c/ X+ vRound 1) b; {: K- e1 t
1,2,3,4 vs 5,6,7,8 = equal
1 g4 L+ g# T, O- q- K1 A2 \! b) u y
- `+ A# C( D$ ^% U* p8 H% W2 QRound 2
& e: v7 i8 [% o, z# S& d; r4 L9,10 vs 11,12 = 9,10 < 11,126 C7 u! Y: f: Y$ V( @
$ ?! N6 l) _5 c9 fRound 3
; Y9 l# B) X2 V9 vs 10 = 9 > 10
* a. ~/ g( S% y. j+ l6 l( p! U8 l: M- j
The answer is 10.
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e.g. #2 假設7為較輕的一粒" A @" g( P# n5 A4 A! ?7 M
Round 1
* h% {+ ]0 ?: d n1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
- G k8 X; o/ q9 n8 i; c' E( n' G8 a7 n! |1 E
Round 2- E( V9 I; u. @
5,6 vs 7,8 = 5,6 > 7,8
; p6 U+ \9 ]- C: I: k/ |6 ?/ b
7 X1 h- W' E' URound 33 ~, `: ^1 X" w
7 vs 8 = 7 < 8
% H8 [, k9 |! V* \. E* ?7 E+ Q
$ u+ ^2 O1 Y" X( F0 b) yThe answer is 7.
: ~! V$ C/ [% ?( V6 ~# A
& O2 |4 M5 J8 [ Te.g. #3 假設13為較輕的一粒
5 r3 C" _" I9 F0 ]7 Z' _* ^Round 1; i, e J& C8 G9 m: M G
1,2,3,4 vs 5,6,7,8 = equal
, v* z1 i' {, X8 ~( q5 X( |' `- b V1 y: \4 I
Round 21 t9 \! T4 m4 z# M3 {4 t" s
9,10 vs 11,12 = equal
" U: n( _$ U: x$ S& N1 U
( s/ ?8 Y q& j: d6 n0 I! ]No Round 3+ ~/ w- C' W9 l5 y( L
, B% U# r. e! g4 J9 TThe answer is 13.0 D( }7 i) g) Y( L, l9 D
' o$ M# C0 b1 P; K唔知我答得正唔正確呢?! " h( |6 u$ ]$ P
( m0 o. z0 x( a8 w( ?
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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