hello1997

分3組4隻波子秤; b1 H0 I- Q) E9 x! W* |

( g  p$ k8 T2 b1 T/ N: t$ `% nGroup A: 1,2,3,48 F7 y. z( h6 o$ p' N1 |
Group B: 5,6,7,8
7 b5 z7 c+ L8 A$ z$ ~- W  w) CGroup C: 9,10,11,12
5 @, X) v/ y  m3 k& b" B: N- ]Group D: 13
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Round 19 e6 |  O* c3 Q) T# {; @9 g+ K
Group A vs Group B, ^" R: o! ~8 @6 A9 v
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
( b( g( M( x# G2 E; y0 Z. B再在Group C拆成:3 H- C* j5 s% d& o
Group Ca: 9,10
1 @& i1 f; s: y" SGroup Cb: 11,12
* ~1 r& k  U/ M* p然後再秤, 如一樣, 即13為較輕一粒.7 x: C0 s" O9 G/ P" d
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如不同, 即較輕一組有一粒較輕波子在其中, " |2 ~( ?) {+ i
要再秤, Round 3, 之後便知答案.; e: s( g0 n0 u  A0 c; \1 A

) B% J' O/ c6 ee.g. #1 假設10為較輕的一粒. x- [8 E8 x/ ^
Round 1- m2 E2 o: g) n9 s& C
1,2,3,4 vs 5,6,7,8 = equal+ m3 y9 \# f; p7 U: w
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Round 29 M3 l3 W- i2 D4 F7 ?6 g
9,10 vs 11,12 = 9,10 < 11,12
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Round 34 k0 r" t& \, ]7 D4 n, N& u3 k
9 vs 10 = 9 > 101 Q' u! F3 [7 j( x% M) a

: W, L" l# ]( v% ]8 Y0 V8 W( FThe answer is 10.& r+ Y) |1 \9 A9 A" z" S
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e.g. #2 假設7為較輕的一粒
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1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8( P& `8 ?; o  d2 ]1 g  H* |0 q

9 i) D5 l4 k" B9 `0 G, iRound 2
6 O" }# N, V  N. G$ T3 ?0 \% Q2 R, ~' l5,6 vs 7,8 = 5,6 > 7,89 s# q/ g3 i/ O
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Round 3  M2 X* ~& p- d& w. f" p' I
7 vs 8 = 7 < 8- [8 h) n* R7 R4 `2 @
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The answer is 7.' ]$ b* c" O) B4 ?' E- i

- w2 i# ?# Z. N8 {3 b( P6 l7 q" R, o7 z4 se.g. #3 假設13為較輕的一粒
: ]- p1 g0 h; }1 X1 q1 U$ R0 ZRound 19 Y' b! l, Q- N
1,2,3,4 vs 5,6,7,8 = equal6 |; p! g: q' x
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Round 2
! p9 t& h  x; j7 ~! r9,10 vs 11,12 = equal
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( y( e8 u6 I- j, [, d; i# J" YNo Round 3: c8 ]  P  R: a+ G8 L; s

% n' Z# i- h$ FThe answer is 13.$ Q* A# p" ?/ x. V* f5 k

! e7 ^# o' C0 _) k7 P+ q- w4 h* A: w3 D唔知我答得正唔正確呢?!
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[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]