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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( m$ Y* X) w9 S$ P! g/ B) Y, i
2 O: i6 c. W1 }! Z$ G6 a. G, Y' n
Group A: 1,2,3,4
5 ^0 V) t6 j& `) aGroup B: 5,6,7,8, K) {* ~6 g( d# X6 E% u
Group C: 9,10,11,12$ b; v5 P* g) Q! J
Group D: 13
2 `% v1 X- Q& D' K+ p1 _
, E& j/ `3 f! `Round 1
! n5 A6 b& N+ B) s$ x: }Group A vs Group B
, c% E% d3 R/ L6 I1 g如A and B一樣, 即較輕一粒在Group C or D
. v/ |+ b0 \( v$ ^' d; U% v
# d( ?+ i+ u& o) x+ ~Round 2
: t' c( u! n3 x: m- r再在Group C拆成:
8 R, [8 ?1 u3 c$ R7 Y. ]8 p4 A, AGroup Ca: 9,10) b; Q2 l& v% |" o9 D8 A! M- u
Group Cb: 11,12: S7 J Y7 n6 @9 G2 H9 _2 X( f
然後再秤, 如一樣, 即13為較輕一粒.
; Q5 s3 B' ~% Z8 F% x3 [2 v( x' S) A- ~/ R2 g& G1 Y0 C+ I
如不同, 即較輕一組有一粒較輕波子在其中, + F2 N1 C& a; Z% j- B
要再秤, Round 3, 之後便知答案.
9 j" |9 p" l9 H. n8 p* W2 s5 Z1 R& I, B8 w! i" U
e.g. #1 假設10為較輕的一粒
. _+ S2 n; M: QRound 1, L; {: ~. B* L! J
1,2,3,4 vs 5,6,7,8 = equal
' K8 c2 a6 \( ~% \, |/ N
( u7 \1 `- l4 r9 M1 c3 ]' rRound 2
/ g1 ?" O2 @- W( \9,10 vs 11,12 = 9,10 < 11,12
3 f N* T$ ~+ V- r2 Z4 m$ h1 `2 l4 i. Q' f* b) e/ y1 M! k, L: |& A6 k
Round 3. ?7 N9 _8 h. K/ j+ w% ~
9 vs 10 = 9 > 10" B# k8 V& U! d9 u2 P" {2 Y
5 p$ o4 C" }1 j4 g1 WThe answer is 10.
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e.g. #2 假設7為較輕的一粒 A: @7 `% R! {. P/ i
Round 17 S$ G5 u% o- D- V
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8+ M% j- |- i% D' {& j1 c8 i- T
" z; f. y7 `* pRound 2
: L1 c# n: e0 A5,6 vs 7,8 = 5,6 > 7,8
8 k3 f2 g& d# }. E% J6 v) {5 E: v
* Y+ R; D* Q+ P1 `1 o; vRound 3
8 L1 @# ~3 [6 P$ ^% `: }7 vs 8 = 7 < 8) L# k- |* b6 b
+ V1 W$ D1 \" p3 d( KThe answer is 7./ l+ { k* y t8 T4 ^- S; ^, h4 `6 ]
) I2 T2 y' F) `1 U* r6 [0 J ze.g. #3 假設13為較輕的一粒$ S, a- y' k4 X7 k( u8 \
Round 1
" e8 Y( c9 `% a6 P9 z1,2,3,4 vs 5,6,7,8 = equal
) L- a s$ a% t" E# O7 e" q& p& F5 K2 O* P* `
Round 2* t, s& s+ g6 E( [" A3 L7 X
9,10 vs 11,12 = equal# V, u" c+ J V5 I, W' ^- q
& S3 r8 O: z$ z4 G# S- t
No Round 3
: V4 C4 `8 p3 p3 d
: b( m8 m; L! X& r* \The answer is 13.
+ p7 U3 V+ U" p( b+ N7 M$ t- x" T6 c7 k8 C) v+ ^& O
唔知我答得正唔正確呢?! 
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* c) I9 `0 G' ]/ U* z0 E[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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發表於 2007-3-1 11:57 PM
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