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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
0 q! u2 @+ }' t; x3 R" _9 V& F4 u, r6 R$ W! C' N
Group A: 1,2,3,4- O4 J% | [% j4 V* u2 Q; N
Group B: 5,6,7,8
' r9 b; |7 F4 WGroup C: 9,10,11,129 f( U- F" ^' e% D1 `
Group D: 13: X$ a( ]" j9 Q
) b" O- D: c; q) |- ?Round 1. w- L! n1 V! K1 D- `0 c+ W
Group A vs Group B
! P3 e/ }3 I, f3 T4 ]- o如A and B一樣, 即較輕一粒在Group C or D2 C( r) S- ^3 {, L& X
% e9 s1 X1 {+ k5 d* C X
Round 2
0 ?5 F1 _# U! z& S; h再在Group C拆成:
& c! w' Y' e8 [, E( ^" qGroup Ca: 9,10; z; C/ o8 a- Z, k, W7 \' X' f- _8 r
Group Cb: 11,12& y0 D2 @4 d; {4 j6 ]/ g
然後再秤, 如一樣, 即13為較輕一粒.- K- A% C. l' V
# W A6 z/ I# r+ Q3 [如不同, 即較輕一組有一粒較輕波子在其中,
; X+ v/ U0 M2 W% z! w, m要再秤, Round 3, 之後便知答案.
6 p. N u9 v% x+ i$ O1 V: u
5 ` G( i ~+ H0 h* F1 p% Ue.g. #1 假設10為較輕的一粒) q3 p4 k' X4 q) k. X
Round 1
0 j. M4 G# r; D# s# z" Y1 i1,2,3,4 vs 5,6,7,8 = equal* w- A# n+ h- ]8 C* s1 i) Y
" J* e! Y, I5 B8 S) O- VRound 2
# p7 o, ?! x3 \7 h9,10 vs 11,12 = 9,10 < 11,123 W+ `( w! M; s
1 H2 l- o! I. h0 g7 ~+ Z0 wRound 3
! l9 C, Z8 V& t* `0 A9 vs 10 = 9 > 10
7 C2 b7 O: z" y" U% u3 H5 I- N
3 S( h- I9 R& o! cThe answer is 10.% |$ }7 e/ q2 R6 o
# x$ p, Q3 C5 ?6 g0 u
e.g. #2 假設7為較輕的一粒5 L# u! x0 z9 z) a4 r3 d
Round 1, ^$ S: I4 |3 V$ I/ i" T: E
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
$ u2 ]( ^( `2 A
: F8 j& C4 Y+ e xRound 24 d I- o/ z- f$ R
5,6 vs 7,8 = 5,6 > 7,81 _) [1 a; F0 k% e' p9 a
! M3 w) s; c: [1 Y" U/ P0 YRound 3
; |; f- R9 E% n; ~, S/ J* s+ `/ O7 vs 8 = 7 < 8
$ {6 j5 Y6 x1 B! a" R0 ]
4 U. n9 o% X+ Y8 D6 AThe answer is 7.
) T+ f# y. s2 t2 [" c. R* C% h) }1 Y6 a4 l, X! N6 i
e.g. #3 假設13為較輕的一粒, `9 C0 Q; w1 w* \; q( F- P) z' T6 T
Round 12 v% }% W7 V @
1,2,3,4 vs 5,6,7,8 = equal9 Z% E8 |; Y5 v) K% |- g! w
. B3 J4 b$ ?& @! {' s7 h
Round 2
]$ ~: z4 S U5 I. i6 J9,10 vs 11,12 = equal" R; L. b% ^ E y6 C, {
. L$ S$ s8 X p' X% MNo Round 3+ j, F- u, ?( r; E
: l" ^3 J4 H4 z( W7 x) r! lThe answer is 13.
z, x" |0 f. Q' P7 _) I' `8 M u1 {" v/ }7 o5 [ W0 p
唔知我答得正唔正確呢?! 
* ~- \; z {# r- p" ^- f
, O8 ^% ^% m9 A t" c. Y: j, X% M; A[ 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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