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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& F% M1 y& G/ m: p8 S1 @- G
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Group A: 1,2,3,4. D9 {) e3 D4 g; s* h! x
Group B: 5,6,7,8
# n$ ]; n/ R' A$ D) fGroup C: 9,10,11,12
, g5 d, V. s4 z+ F: i# ?. d$ z [ zGroup D: 13
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' g* b0 y9 ~, g7 P6 v7 M) T- yRound 1
! K) c) z; R) R( Y; kGroup A vs Group B( v. j5 p: P9 D* {$ F7 Z
如A and B一樣, 即較輕一粒在Group C or D
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" I+ k, W' e# e. F( r( d' fRound 2
8 { ]5 u: e! g; ^* Z* Y3 c. B7 J. F* c再在Group C拆成:
4 I+ U n: O G9 J2 r% ^Group Ca: 9,10' [2 H' G7 j6 B9 _ v2 V
Group Cb: 11,12
3 R/ B" [8 Q: J) ~然後再秤, 如一樣, 即13為較輕一粒.: J9 @8 a9 U! g+ N& r+ I% }
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如不同, 即較輕一組有一粒較輕波子在其中,
: r4 C4 q$ Z. w+ ^要再秤, Round 3, 之後便知答案.6 L) m% f6 F1 ^9 F
" {& H" F1 l/ o" i% Q9 se.g. #1 假設10為較輕的一粒
/ s3 t. v1 m" |5 }8 Z: G6 [# dRound 1
, I [' X, C" l& p* `1,2,3,4 vs 5,6,7,8 = equal
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8 ~& d0 M& b# N: K. ]0 O9 ~% WRound 2- y8 w n, E* H: ?' Q. b- T. ~
9,10 vs 11,12 = 9,10 < 11,12) |5 o/ R0 r# u" |) A# N
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Round 3
! S! {% {+ B0 ~ R9 vs 10 = 9 > 10! h6 ], D+ [% f+ ~7 U
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The answer is 10.
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e.g. #2 假設7為較輕的一粒
( i# |3 a2 n, z) _+ bRound 1/ U4 M8 e9 k: y* [
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,89 X4 O7 e* c+ t( x
9 v3 p' w% Y- x. s0 }Round 2# Q( y0 K8 ~. e7 r
5,6 vs 7,8 = 5,6 > 7,8( s( [# w# ]# k% {* z( @1 R1 G9 I8 A
: N* M6 l/ ]8 R4 k8 s$ tRound 3
* o* y* o0 B* ~3 m% m* z2 L7 vs 8 = 7 < 8- [: c {( V) y2 T
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The answer is 7.
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\. e2 g! b1 s h: ?/ Ee.g. #3 假設13為較輕的一粒
3 l- M3 v9 Z: h0 Y9 XRound 1- C! z; l z$ P6 Z
1,2,3,4 vs 5,6,7,8 = equal
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Round 2' `. Y. ~) M a$ B5 J) a
9,10 vs 11,12 = equal
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No Round 30 M8 e; {' q. x! ?0 p7 k1 B7 k
9 s0 B+ ]+ W9 ^' [( P1 A4 {The answer is 13.! d5 b& ^3 N1 a9 j% M
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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 ] |
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發表於 2007-3-1 11:57 PM
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