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In a standard 5-card poker hand for 1 deck:

Calculate P(Royal Flush)

Royal Flush Hands

Ace of ClubsKing of ClubsQueen of ClubsJack of Clubs10 of Clubs
Ace of DiamondsKing of DiamondsQueen of DiamondsJack of Diamonds10 of Diamonds
Ace of HeartsKing of HeartsQueen of HeartsJack of Hearts10 of Hearts
Ace of SpadesKing of SpadesQueen of SpadesJack of Spades10 of Spades

Calculate Total 5 Card hands

Choose 5 cards from 52 cards

Total Hands  =  52!
  (52-5)! * 5!

Total Hands  =  52!
  47! * 5!

Total Hands  =  (52 * 51 * 50 * 49 * 48) * 47!
  47! * (5 * 4 * 3 * 2 * 1)

Cancelling the 47!, we get:

Total Hands  =  311,875,200
  120

Total Hands = 2,598,960

Build Probability

Possible Royal Flushes = Possible ways to get 10,J,Q,K,A all suited

Possible Royal Flushes = 1 way * 4 possible suits (Spade,Heart,Diamond,Club) = 4

P(Royal Flush)  =  Royal Flushes
  Total Hands

P(Royal Flush)  =  4
  649,740

Reduce top and bottom by 4

GCF = Greatest Common Factor

P(Royal Flush)  =  4
  2,598,960

GCF for 1 and 649740 = 4

P(Royal Flush)  =  1
  649,740

Final Answer

Decimal probability = 1.5391E-6


You have 2 free calculationss remaining




What is the Answer?
Decimal probability = 1.5391E-6
How does the 5 Card Poker Hand Calculator work?
Free 5 Card Poker Hand Calculator - Calculates and details probabilities of the 10 different types of poker hands given 1 player and 1 deck of cards.
This calculator has 1 input.

What 1 formula is used for the 5 Card Poker Hand Calculator?

Total Possible 5 Card Hands = 2,598,960

For more math formulas, check out our Formula Dossier

What 4 concepts are covered in the 5 Card Poker Hand Calculator?

5 card poker hand
combination
a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter
nPr = n!/r!(n - r)!
factorial
The product of an integer and all the integers below it
probability
the likelihood of an event happening. This value is always between 0 and 1.
P(Event Happening) = Number of Ways the Even Can Happen / Total Number of Outcomes
Example calculations for the 5 Card Poker Hand Calculator

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