w********g
发帖数: 10 | 1 A bag has 3 red marbles and 2 blue marbles. You draw two marbles at once,
randomly. What are the odds they
are the same color?
小弟probability学的不好，望赐教，谢谢! |
r*******y
发帖数: 290 | 2 (choose 2 from 3) + (choose 2 from 2)/choose 2 from 5 = 4/10=2/5
【在 w********g 的大作中提到】
: A bag has 3 red marbles and 2 blue marbles. You draw two marbles at once,
: randomly. What are the odds they
: are the same color?
: 小弟probability学的不好，望赐教，谢谢!
|
g********i
发帖数: 770 | |
w********g
发帖数: 10 | 4
谢谢！
【在 r*******y 的大作中提到】
: (choose 2 from 3) + (choose 2 from 2)/choose 2 from 5 = 4/10=2/5
|
w********g
发帖数: 10 | 5
谢谢！
【在 g********i 的大作中提到】
: 3/5*2/4+2/5*1/4=2/5
|
K******C
发帖数: 230 | 6 (3*2+2*1)/P(5,2)=2/5
【在 w********g 的大作中提到】
: A bag has 3 red marbles and 2 blue marbles. You draw two marbles at once,
: randomly. What are the odds they
: are the same color?
: 小弟probability学的不好，望赐教，谢谢!
|
