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# 1) A bag contains 3 green marbles, three red marbles and 2

Author Message
CEO
Joined: 21 Jan 2007
Posts: 2756
Location: New York City
Followers: 11

Kudos [?]: 852 [0], given: 4

1) A bag contains 3 green marbles, three red marbles and 2 [#permalink]

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25 Feb 2008, 09:02
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

1) A bag contains 3 green marbles, three red marbles and 2 blue marbles. What is the probability of each marble on three successive selections being a different color?
A.1/336
B.1/56
C.3/56
D.9/56
E.9/28

2).What is the probability of getting 2 red marbles and 1 green marble within 3 tries of drawing marbles from the bag?
_________________

You tried your best and you failed miserably. The lesson is 'never try'. -Homer Simpson

Director
Joined: 01 Jan 2008
Posts: 629
Followers: 4

Kudos [?]: 175 [1] , given: 1

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25 Feb 2008, 09:18
1
KUDOS
bmwhype2 wrote:
1) A bag contains 3 green marbles, three red marbles and 2 blue marbles. What is the probability of each marble on three successive selections being a different color?
A.1/336
B.1/56
C.3/56
D.9/56
E.9/28

2).What is the probability of getting 2 red marbles and 1 green marble within 3 tries of drawing marbles from the bag?

1: 3C1*3C1*2C1/8C3 = 3*3*2/(8*7) = 18/56 = 9/28 -> E
2: 3C2*3C1/8C3 = 3*3/56 = 9/56 -> D
CEO
Joined: 21 Jan 2007
Posts: 2756
Location: New York City
Followers: 11

Kudos [?]: 852 [0], given: 4

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25 Feb 2008, 09:34
thanks. just wanted to confirm my answer since i dont have the OAs.
_________________

You tried your best and you failed miserably. The lesson is 'never try'. -Homer Simpson

CEO
Joined: 29 Mar 2007
Posts: 2583
Followers: 19

Kudos [?]: 421 [0], given: 0

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25 Feb 2008, 18:55
bmwhype2 wrote:
1) A bag contains 3 green marbles, three red marbles and 2 blue marbles. What is the probability of each marble on three successive selections being a different color?
A.1/336
B.1/56
C.3/56
D.9/56
E.9/28

2).What is the probability of getting 2 red marbles and 1 green marble within 3 tries of drawing marbles from the bag?

1: (3!)*3/8*2/7*3/6 --> 9/28

2: 3C1*3/8*2/7*3/6 --> 9/56
Re: successive selections   [#permalink] 25 Feb 2008, 18:55
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