the hands of brag dave bogle

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© dw bogle 2001

 
maths & science odds of poker medical puzzles myths
 
the number of possible hands
There are 52 cards in a pack, and 3 cards in a hand, so the answer is any 3 from 52 - or 52C3 in shorthand. The total comes to 22,100.

Here is a script to calculate permutations. For example, any 6 from 49 ( or 49C6 ) will give you the number of different lottery tickets you could buy:

Any from Permutations = 
 
prial [ pair-royal ]

Three of a kind
There are 4 suits, so for each denomination there are 4C3 = 4 prials; there are 13 denominations, which gives 4 × 13 = 52 possible prials.

 
straight flush
In each of the four suits, you can have 12 straight flushes, starting off from Ace through to Queen ( Note that both A-2-3 and Q-K-A are allowed ). That gives 12 × 4 = 48 straight flushes.
All one suit
All in sequence
 
straight

All consecutive
As noted above, there are 12 different sequences (A-2-3 through to Q-K-A). But each of the cards in these hands can come from any of 4 suits, so the number of possible straights is 12 × 4 × 4 × 4 = 768. Subtract from that the 48 straight flushes, and the final figure is 720.
 
flush
In each of the 4 suits, there are a possible 13C3 = 286 permutations of cards. 286 × 4 = 1144, but from that we have to subtract the 48 straight flushes, leaving a true total of 1096.
All one suit
 
pair

Two of same rank
There are 13 denominations, and with 4 suits there are for each denomination 4C2 = 6 possible doubles. So the number of different doubles is 13 × 6 = 78. But for each of these doubles, the hand can have any of 48 different cards as its third card ( only 48, as a prial would result from drawing either of the two remaining cards of the same denomination as your pair). Therefore the total number of possible hands classed as a pair is 78 × 48 = 3744.
 
ace high etc
The techniques for calculating these possibilities are  discussed in the Poker section. For the moment, here is the full table for Brag. 
Highest Card
 
summary tables
Hand Total % Blank Breakdown of Highs %
prial 52 0.24 Ace 3,840 17.38
Straight Flush 48 0.22 King 3,240 14.65
Straight 720 3.26 Queen 2,640 11.95
Flush 1,096 4.96 Jack 2,100 9.50
Pair 3,744 16.94 10 1,620 7.33
Highs 16,440 74.39 9 1,200 5.43
TOTAL 22,100 100.01 8 840 3.80
7 540 2.44
6 300 1.36
5 120 0.54
TOTAL 16,440 74.39

NOTES
  • The percentages are rounded, and so don't quite add up
  • It is easier to get a prial than it is to get a straight flush
    • In that respect the precedences of Brag are unmathematical
  • The median hand [ i.e. the average of the two middle hands]   is K-10-2
    •  So anything better than that is a bonus 
 
maths & science odds of poker medical puzzles myths