(1) r/(b+w) > w/(b+r)
(2) b-w > r
ans:A
請指教 謝謝
[問題] 新GMATPrep PP2-7 DS
版主: shpassion, Traver0818
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[問題] 新GMATPrep PP2-7 DS
由 enim » 2005-12-20 16:30
A certain jar contains only b black marbles, w white marbles, and r red marbles. If one marble is to be chosen at random from the jar, is the probability that the marble chosen will be red greater than the probability that the marble chosen will be white?
(1) r/(b+w) > w/(b+r)
(2) b-w > r
ans:A
請指教 謝謝
(1) r/(b+w) > w/(b+r)
(2) b-w > r
ans:A
請指教 謝謝
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
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由 enim » 2005-12-21 11:15
plz help me~
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
- 帖子: 245
- 注册: 2005-03-25 09:28
- 地址: Taiwan
由 enim » 2005-12-21 16:19
沒人要理我 嗚 
我就自己 打破頭在想了！....
果然是我自己不好好 想破頭
答案A沒錯
A可得出r>w，別無其他可能
下面那題 不知道可不可以麻煩大家一下 謝謝...
我怕他又被煙沒了！
我就自己 打破頭在想了！....
果然是我自己不好好 想破頭
答案A沒錯
A可得出r>w，別無其他可能
下面那題 不知道可不可以麻煩大家一下 謝謝...
我怕他又被煙沒了！
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
- 帖子: 245
- 注册: 2005-03-25 09:28
- 地址: Taiwan
由 enim » 2005-12-21 23:13
clbb \$m[1]:
呃...可以解答一下嗎....
A certain jar contains only b black marbles, w white marbles, and r red marbles. If one marble is to be chosen at random from the jar, is the probability that the marble chosen will be red greater than the probability that the marble chosen will be white?
(1) r/(b+w) > w/(b+r)
(2) b-w > r
ans:A
我不知道該如何講解這題
(1)
情況有三種r>w，r<w，r=w
這三種情況，符合條件一的只有r>w
就這麼簡單
故充分
(2)
只能知道b>w+r
其他無法得知
不充分
所以選A
FYI
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
- 帖子: 245
- 注册: 2005-03-25 09:28
- 地址: Taiwan
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