og P672 13 M4 }1 k% V' {6 j8 i. n! R/ e0 y
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Kyle's lock combination consists of 3 two-digit numbers# k: f3 b$ J% x& ^
one number is odd 4 N4 B1 }5 D' K0 l3 q+ Wone number is multiple of 5 t, R3 w K& T+ E" u8 L3 P# A1 D2 \
one number is the day of the month of Kyle's birthday # u0 Y' o2 J% l! k8 _9 ]7 G 7 t6 O, v. h) Yif each number satisfies exactly one of the conditions which of the following could be the combination to the lock? 8 P. C$ X8 j$ ~4 @: R 9 ~0 X+ y5 p( c / Y# O, L: I3 x: k* @# B ! p4 ?' P) Z8 d2 h0 _& Q
a 14 20 13* k- r/ I6 O3 c5 C
b 14 25 13% t+ X: M& o$ x
c 15 18 16 7 ~* _4 ]1 k% m* K( X* [d 20 15 20 2 i% a5 ?: i+ Fe 34 30 21 7 L! w+ z1 e4 m* w/ Z答案是a 我觉得b d 都可已啊
原帖由 hyacinth 于 2007-9-7 13:10 发表& p" U# {( e, E R! w9 M5 j
b 有两个odd $ f. V" |1 s& v% G* ~. fd 有三个mutiple of 5 0 f; a- `1 R, y$ F. D5 ?& z$ R2 |/ d/ i
貌似这样理解satisfies exactly one of the conditions ?