G*******m
发帖数: 16326 | 1 I have a set of 3 very strange dice cubes.
Each cube has two faces with 1, two faces with 2 and two faces with 3.
I am going to play a game with three cubes.
I pay $10 to play the game.
If the three dice come up with an even total, I win $18.
Otherwise I lose.
Question：
If I play this game 100 times, how much will I win or lose? |
j*m
发帖数: 833 | 2 lose 133.33
【在 G*******m 的大作中提到】
: I have a set of 3 very strange dice cubes.
: Each cube has two faces with 1, two faces with 2 and two faces with 3.
: I am going to play a game with three cubes.
: I pay $10 to play the game.
: If the three dice come up with an even total, I win $18.
: Otherwise I lose.
: Question：
: If I play this game 100 times, how much will I win or lose?
|
j*m
发帖数: 833 | 3 I should say
expected to lose this much
【在 j*m 的大作中提到】
: lose 133.33
|
G*******m
发帖数: 16326 | 4 厉害。。。。
步骤呢？
【在 j*m 的大作中提到】
: lose 133.33
|
x*******i
发帖数: 1791 | |
j*m
发帖数: 833 | 6 小学水平的题吧,会数数就成
even的出现概率是13/27
【在 G*******m 的大作中提到】
: 厉害。。。。
: 步骤呢？
|
c******e
发帖数: 1581 | 7 -66.7.
【在 G*******m 的大作中提到】
: I have a set of 3 very strange dice cubes.
: Each cube has two faces with 1, two faces with 2 and two faces with 3.
: I am going to play a game with three cubes.
: I pay $10 to play the game.
: If the three dice come up with an even total, I win $18.
: Otherwise I lose.
: Question：
: If I play this game 100 times, how much will I win or lose?
|
G*******m
发帖数: 16326 | 8 Need to know combination and permutation.
【在 j*m 的大作中提到】
: 小学水平的题吧,会数数就成
: even的出现概率是13/27
|
G*******m
发帖数: 16326 | 9 show your step.
【在 c******e 的大作中提到】
: -66.7.
|
c******e
发帖数: 1581 | 10 sorry. -133.3
【在 G*******m 的大作中提到】
: show your step.
|
G*******m
发帖数: 16326 | 11 3P3 = 27
It starts with 111 and ends with 333, so the number of even sum is 1 less
than the number of odd sum.
So the answer = (13/27*18 - 10) * 100 = -133 1/3
I will lose 133 1/3 |
l******n
发帖数: 507 | 12 is this your homework from school? i guess |
