JJ614,610 ，Friday 就要考了，请大家帮忙

icecream_mba · 发表于 2006-10-25 20:40:00

请教几道JJ，Friday 就要考了，请大家帮忙

614. A jar contains 4 black marbles and 6 blue marbles. What is the probability that one blue and one black marble will be picked without replacement?

讨论：C₄¹C₆¹/C₁₀²=2/3

My ans. Is 4/10 x 6/9 = 4/15

610. When 0<=x<=4, f(x)=7-4; when 4<x<=6, f(x)=x/2-2. What is the range of f(x)?

讨论：Reference answer: 0<f(x) <=1 and 3<=f(x) <=7 同意

zhunarold · 发表于 2006-10-25 21:08:00

614如果要这么算的话要加上6/10*4/9.跟答案是一样地.最后的数是8/15

MaccMichAA · 发表于 2006-10-25 21:48:00

小的答案是是8/15

(4/10)*(6/9)+(6/10)*(4/9)

第一次是红还是蓝色的都没有说所以一红二兰一兰二红

这样做有什么错呢？

icecream_mba · 发表于 2006-10-26 08:39:00

Thx.. how about this question?

610. When 0<=x<=4, f(x)=7-4; when 4<x<=6, f(x)=x/2-2. What is the range of f(x)?

讨论：Reference answer: 0<f(x) <=1 and 3<=f(x) <=7 同意

specters · 发表于 2006-10-26 10:13:00

以下是引用icecream_mba在2006-10-26 8:39:00的发言：

Thx.. how about this question?

610. When 0<=x<=4, f(x)=7-x; when 4<x<=6, f(x)=x/2-2. What is the range of f(x)?

讨论：Reference answer: 0<f(x) <=1 and 3<=f(x) <=7 同意

[此贴子已经被作者于2006-10-26 10:13:43编辑过]

JJ614,610 ，Friday 就要考了，请大家帮忙

JJ614,610 ，Friday 就要考了，请大家帮忙

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