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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9 J( a4 }; z# G, P( J7 Q( ~
- k9 D8 Q5 S1 `0 h6 oGroup A: 1,2,3,4- G( U7 j9 r; ]
Group B: 5,6,7,8
& c/ ]1 j. S+ }7 E& F) nGroup C: 9,10,11,12
5 U0 m3 L+ x, K8 B: B; SGroup D: 13
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+ ? ?% z$ M6 [% ?5 XRound 1( J7 c3 w W( X$ r3 E+ x
Group A vs Group B
; @0 s# }+ n! C1 L如A and B一樣, 即較輕一粒在Group C or D
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9 o: Y6 L3 h& c! q2 w5 z4 kRound 2, c' N$ ~! L5 f x- _
再在Group C拆成:+ b/ F6 U/ `# k4 z D
Group Ca: 9,102 M/ M4 X" l5 H% R
Group Cb: 11,12- H7 a7 H8 Z/ j( w
然後再秤, 如一樣, 即13為較輕一粒.. Q8 h& C0 V# P; F, `0 }; I
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如不同, 即較輕一組有一粒較輕波子在其中, * z# L: C! p' Q N
要再秤, Round 3, 之後便知答案.1 K: I/ L5 }1 P1 v, z1 w
H- M) \' `: o- e: O. a. z. he.g. #1 假設10為較輕的一粒
- g0 j0 p- ^& b: K: xRound 1
5 B, |8 N3 L# d+ t: C8 x" J1,2,3,4 vs 5,6,7,8 = equal' u* A) H6 U2 u6 C5 i5 C* u
' c9 S, n. V l! ]Round 2
6 z2 }" n7 y" i! Q% |, P9,10 vs 11,12 = 9,10 < 11,12
8 S0 k9 y) Z5 ~! m- w7 }7 G# v; {2 t5 p$ w$ J; ?7 C1 O2 b
Round 35 K: m* s9 o' z. {
9 vs 10 = 9 > 10
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# s* C. V, h8 i; V! e0 A% ` UThe answer is 10.% B3 B* D% \9 z4 G
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e.g. #2 假設7為較輕的一粒
, c+ C, d* v5 Q, e3 A9 C7 PRound 12 L$ W8 Y% H, r. e. B
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,85 ~ u" y% P1 w: i5 w6 l+ q
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Round 2
+ n5 H! A- K) d2 }: z! r8 q5,6 vs 7,8 = 5,6 > 7,8
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Round 3& {, U! {2 ~9 U, s& F2 q6 Z
7 vs 8 = 7 < 8' q( z" l1 ~+ a G8 F$ `, @
4 i* e7 Z! T$ i* J& e" UThe answer is 7.
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e.g. #3 假設13為較輕的一粒
' _% N. O+ m. gRound 1
5 v/ T6 m" M) Q/ }1,2,3,4 vs 5,6,7,8 = equal
- B% ^6 l( d' b# ~' H9 j W5 f. v/ C: i" C$ V+ I; @( }
Round 2
# v/ F% Q: n4 g/ a Q. }- j; X9,10 vs 11,12 = equal' t# C$ S( X/ d+ B. e0 N2 H2 p7 }
5 u- U( j$ m- v. b' M0 S: u u
No Round 3! ?$ t+ u: s# q3 d2 U* _1 U
+ {; j4 N7 s5 U6 D
The answer is 13.
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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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