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3 questions in the tradition of Stolyar... Three fair dice

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Manager
Joined: 06 Jun 2003
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09 Dec 2003, 08:07
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

3 questions in the tradition of Stolyar...

Three fair dice are rolled, what is the probability that

(1) you get 3 sixes?
(2) you DO NOT get 3 sixes?
(3) you get ATLEAST one six?

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SVP
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09 Dec 2003, 08:15
in the tradition... looks great!!! nice to see it!!!

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Director
Joined: 28 Oct 2003
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09 Dec 2003, 08:49
Quote:
(1) you get 3 sixes?

(1/6)^3

Quote:
(2) you DO NOT get 3 sixes?

1-((1/6)^3)

Quote:
(3) you get ATLEAST one six?

1-((5/6)^3)

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Manager
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09 Dec 2003, 09:44
Let's increase the difficulty a bit, what is the probability that

you will NOT get EXACTLY 2 sixes?

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Director
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09 Dec 2003, 11:52
Quote:
Let's increase the difficulty a bit, what is the probability that

you will NOT get EXACTLY 2 sixes?

x66 (5 possibilities)
6x6 (5 possibilities)
66x (5 possibilities)

15 ways out of 6^3 to get exactly 2 sixes.

((6^3)-15)/6^3

Last edited by stoolfi on 09 Dec 2003, 17:49, edited 1 time in total.

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Manager
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09 Dec 2003, 15:48
Is it 25 or 15? (3 x 5)

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Director
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09 Dec 2003, 17:48
My mistake. I edited my errant message.

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CEO
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13 Dec 2003, 02:02
bluefox420 wrote:
3 questions in the tradition of Stolyar...

Three fair dice are rolled, what is the probability that

(1) you get 3 sixes?
(2) you DO NOT get 3 sixes?
(3) you get ATLEAST one six?

Quote:
(1) you get 3 sixes?

only one way out of 216 ways => 1/216

Quote:
(2) you DO NOT get 3 sixes?

1- 1/216 =215/216

Quote:
(3) you get ATLEAST one six?
[/quote]

1- (5/6)^3 = 91/216

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13 Dec 2003, 02:05
bluefox420 wrote:
Let's increase the difficulty a bit, what is the probability that you will NOT get EXACTLY 2 sixes?

P (Exactly two sixes) = 3 * 1/6^2 * 5/6 = 5/72

Reqd prob = 1 - 5/72 = 67/72

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CEO
Joined: 15 Aug 2003
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13 Dec 2003, 02:06
stoolfi wrote:
Quote:
Let's increase the difficulty a bit, what is the probability that

you will NOT get EXACTLY 2 sixes?

x66 (5 possibilities)
6x6 (5 possibilities)
66x (5 possibilities)

15 ways out of 6^3 to get exactly 2 sixes.

((6^3)-15)/6^3

Kudos [?]: 919 [0], given: 781

SVP
Joined: 30 Oct 2003
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Location: NewJersey USA

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05 Jan 2004, 17:16
Hi stolyar

for the improved question you need to add getting 3 sixes to getting 1 six.

x66
6x6
66x
666

1/6^3 + 3 * 1/6 * 5/6 * 5/6

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SVP
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10 Jan 2004, 15:33
My bad. stoolfi is right on the improved question. Q is asking not getting exactly 2 sixes.

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10 Jan 2004, 15:33
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