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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, f8 M$ L; f6 C
5 J2 R, ]+ ?( C3 l8 P. g6 N
Group A: 1,2,3,4) t" s& h) W8 E0 t8 @
Group B: 5,6,7,87 m% u- Q9 _% T9 |1 W. W5 W
Group C: 9,10,11,12
7 Y0 v5 g4 ^' r4 s7 z* o5 h! Y. S( |Group D: 13
; C# F7 L% o( M+ p7 ^! u/ D
# r% H4 T2 k, C% C) u5 ERound 1- y: I( G/ U$ V, x" V( k3 [& q( B
Group A vs Group B( k0 j2 J9 L, R+ i3 q+ Q$ [# ~8 B; Z
如A and B一樣, 即較輕一粒在Group C or D
/ P V4 B% Q. Z( H/ h" W4 \ h* z9 I; X
Round 26 C% f5 Q" c# J
再在Group C拆成:" w. I' X2 f& K; f7 k) D& C. |" a
Group Ca: 9,10$ T- \# L- R& P8 h* }* F* _
Group Cb: 11,12
B2 V: u0 A6 j* Y然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中, 8 D# _6 [& ?" D4 ~8 i
要再秤, Round 3, 之後便知答案." {) P! s' y; c0 {2 k, o$ F1 I
8 D6 [# z: Y# {* L* D7 Ae.g. #1 假設10為較輕的一粒3 Q1 O% W A) R- H% ]7 r" V
Round 1
9 w [3 C# Y) m: b# u' N$ A1,2,3,4 vs 5,6,7,8 = equal
5 E8 n5 ~8 O, p% ^4 M! p8 X) f, a2 Z* J" i* A) r* {1 Y; q
Round 22 g, h/ |* o2 t
9,10 vs 11,12 = 9,10 < 11,12
: b l6 V, N7 Y1 G7 P$ B, @) g3 i# r$ F- Z4 a% a5 T6 B
Round 37 c2 Q" Z$ X% o; P
9 vs 10 = 9 > 10
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H% w" ~( M5 D, O! U* LThe answer is 10.
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9 Q! p; b7 U! `7 L* |& a% [; o% Fe.g. #2 假設7為較輕的一粒' G" L1 |5 u/ L8 N( l# [
Round 1
; d+ s/ J1 F: ?1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8( s, ^' D# Q5 ~& v5 r2 Q' c; L
# N/ k/ n. O7 A0 s# T( gRound 2
* g4 {8 j- {) Y! U3 W, @, p+ n5,6 vs 7,8 = 5,6 > 7,8! Q+ Y/ N" d/ u$ O r. R
0 i, y% w- z; w, e9 y b2 _5 q
Round 3
# J7 r* ?0 U# w' X d- Y$ f: ^7 vs 8 = 7 < 8
: w; N5 |: t% `
* K9 i8 b( R+ {. h/ X* W1 ~The answer is 7.
: i R5 T* q9 z `8 h* g4 g; \* W0 o0 Y* r& P3 `3 i, m3 y
e.g. #3 假設13為較輕的一粒
+ V) {% V- T1 d- bRound 1
' q2 Y W6 A. ^* B& _+ o1,2,3,4 vs 5,6,7,8 = equal3 U; d, ~! l0 G" Z! F& b
2 L- C* _( b7 M. N0 q
Round 24 J+ b8 z4 K s
9,10 vs 11,12 = equal& G$ M7 I" q7 p5 o4 [. W, ^
/ p9 M {. i7 ]! B8 c( v- s
No Round 31 a4 Z" N2 p+ ~ P
( i# o8 u, q5 u, W' t" p8 x+ s, u. l
The answer is 13.
3 ?5 a3 I: g. i) y( g$ ~0 J/ A2 I- l, o( ^! L8 Q
唔知我答得正唔正確呢?!
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. r8 L: [* V) C, {# E[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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