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  #1  
Old September 12th, 2009, 02:00 PM
Blue Efficacy Blue Efficacy is offline
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Default 4 Blackjacks in a row!

Today I got 4 blackjacks in a row.

On a double deck game no less!

Too bad I was betting table minimum for the last 3

Does anyone know the exact odds of this happening? I know they must be astronomical.
  #2  
Old September 12th, 2009, 02:25 PM
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creeping panther creeping panther is offline
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Quote:
Originally Posted by Blue Efficacy View Post
Today I got 4 blackjacks in a row.

On a double deck game no less!

Too bad I was betting table minimum for the last 3

Does anyone know the exact odds of this happening? I know they must be astronomical.

You are on a roll, a Royal now this! Take some advice from a neophyte, employ a side of aces in the DD.

CP
  #3  
Old September 12th, 2009, 05:58 PM
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daddybo daddybo is offline
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Quote:
Originally Posted by Blue Efficacy View Post
Today I got 4 blackjacks in a row.

On a double deck game no less!

Too bad I was betting table minimum for the last 3

Does anyone know the exact odds of this happening? I know they must be astronomical.

I believe it's something like 192,000 to 1 for double deck. at any rate it's a huge! . congrats.
  #4  
Old September 12th, 2009, 06:47 PM
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FLASH1296 FLASH1296 is offline
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Default consecutive BJ's

No, it is nothing remotely like 192,000 to 1 -- UNLESS the precise 4 hand sequence is predicted in advance.

That is to say, that with every hand that you play you create yet another 4 hand sequence starting point.
Ergo, you will have hundreds, even thousands of chances to pull 4 consecutive B J' s in the course of just a year.

On an interesting note, I was playing single deck in No. Nevada once when the dealer gave herself 4 consecutive 'snappers'.
It turned out that black chip players with skill were not barred at J.A.'s Nugget in Sparks.
They were simply cheated until they "got the message".
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Old September 12th, 2009, 07:08 PM
shadroch shadroch is offline
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Very nice.
I've had three on a bunch of occasions, and even have gotten the Ten or Ace on the next hand, but have yet to seal the deal.
Now get to work on getting 5!
  #6  
Old September 12th, 2009, 07:29 PM
InPlay InPlay is offline
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Quote:
Originally Posted by Blue Efficacy View Post
Today I got 4 blackjacks in a row.

On a double deck game no less!

Too bad I was betting table minimum for the last 3

Does anyone know the exact odds of this happening? I know they must be astronomical.

odds for 1 blackjack is about 1 in 20 (closer to 1 in 21 but this keeps the math simpler)
odds for 2 in a row is one in 400.
odds for 3 in a row is one in 8,000
odds for 4 in a row is one in 160,000

How did you calculate those numbers?

The general formula is 2*(probability of 10)*(probability of ace). The reason for the 2 is that there are two ways to order the two cards; either the ace or 10 can come first. The probability that the first card will be a 10 is always 4/13, regardless of the number of decks, because there are 16 out of 52 tens in the deck and 16/52 = 4/13. The probability of an ace, given that a 10 has already been removed from the deck is the number of aces divided by the number of cards left. Let n be the number of decks. There are 4*n aces and 52*n-1 cards left. So for n decks the probability is 2*(4/13)*(4*n/(52*n-1)), which is conveniently about 1 in 21. For example for 6 decks the answer is 2*(4/13)*((4*6)/(52*6-1)) = 192/4043 = 0.047489.

http://wizardofodds.com/askthewizard/blackjack-faq.html
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Old September 12th, 2009, 08:51 PM
Blue Efficacy Blue Efficacy is offline
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I figured about one in 150,000 or something like that.

Thanks!
  #8  
Old September 12th, 2009, 08:54 PM
Blue Efficacy Blue Efficacy is offline
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Quote:
Originally Posted by creeping panther View Post
You are on a roll, a Royal now this! Take some advice from a neophyte, employ a side of aces in the DD.

CP
Done and done. It really isn't that much extra work to keep track of 8 aces.
  #9  
Old September 12th, 2009, 08:59 PM
blackjackstudent blackjackstudent is offline
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Inplay, is this assuming we have an infinite number of decks present - see if we are playing a 6 deck games, we only have 24 aces present and if one ace is depleted, the chances of another successive BJ further decreases. I wont worry about the tens because there are 96 tens compared to 24 aces.
  #10  
Old September 12th, 2009, 09:21 PM
Blue Efficacy Blue Efficacy is offline
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Quote:
Originally Posted by blackjackstudent View Post
Inplay, is this assuming we have an infinite number of decks present - see if we are playing a 6 deck games, we only have 24 aces present and if one ace is depleted, the chances of another successive BJ further decreases. I wont worry about the tens because there are 96 tens compared to 24 aces.
And I reckon this effect would be much more severe for double deck!
 

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