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# Compute this !

Topic closed. 18 replies. Last post 12 years ago by fenris.

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New Member
Ontario
Member #4249
April 5, 2004
13 Posts
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 Posted: December 27, 2004, 2:54 pm - IP Logged
Quote: Originally posted by WIN D on December 24, 2004

Thank you very much John. A man after my own heart and a great person to ask about the doubles question. What is the probability of back to back doubles. ....3 in a row...4 in a row? The odds on a double are 27% and average a hit every 3 or 4 days but what is the probability this will happen 2 days in a row. Thank you for your help on this John. Probability on equally like dvents is one thing .....I have posted that before, here and in my blog. This doubles thing however hurts my feelings ...LOL

Would this be right:

Probability of a double coming up:

1) once is 0.27

2) twice in a row is 0.27*0.27=0.0729

3) three times in a row is 0.27^3 =0.019683

CA
United States
Member #2987
December 10, 2003
832 Posts
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 Posted: December 27, 2004, 11:54 pm - IP Logged

WIN D -

fenris is correct in his formulas and response, and thank you. Sorry it took me this long to get back; I was unaware a question was asked. The only caveat here is that triples (is that included in your requirement for a double?) are excluded.

gl

john

Blessed Saint Leibowitz, keep 'em dreamin' down there.....

Next week's convention for Psychics and Prognosticators has been cancelled due to unforeseen circumstances.

=^.^=

New Member
Caracas
Venezuela
Member #9685
December 16, 2004
25 Posts
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 Posted: December 28, 2004, 6:01 pm - IP Logged

To Fenris: Thats correct. Thats the mathematical result. If we see the Real world drawings that vary....

CUL.

Cd__ShOpPeR

New Member
Ontario
Member #4249
April 5, 2004
13 Posts
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 Posted: December 29, 2004, 10:37 am - IP Logged

On the Flipside, you might wonder how many days a double could go with out being picked:

If doubles were not drawn today, what is the chance that doubles will not be drawn tomorrow? In other words, what is the chance that doubles will miss twice in a row?

(1-0.27)^2 = 0.5329

Miss three times in a row:

(1-0.27)^3 = 0.3890

Miss 4 times in a row:

(1-0.27)^4 =0.2840

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