With 5 cards: Straight Flush: approx 72,192 to 1 Royal Flush: 649,740 to 1
With 6 cards:
Straight Flush: approx 12293 to 1 Royal Flush: 108289 to 1
With 7 cards:
Straight Flush: approx 3590 to 1
Royal Flush: 30939 to 1
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The odds of getting a royal flush in five card stud is the same as in any poker game with five cards involved, i.e. 649,740 to 1.
I will assume you numbers are correct, and the odds of NOT getting a royal flush is 649740 to 1, then the odd of a royal flush is the reciprocal of that. When we speak of odds in probability it has a very specific meaning. If P is the probability of an even , then the odds in favor of P are P/(1-P). For example, the odds of getting a 6 when we throw a die is not 1/6, it is 1/6 divided by 1-(1/6) or 1/6 divided by 5/6 which is 1/5 or 1 in 5. The odds of not getting a 6 is 1/(1/5)=5 to 1 So your given odds are 649740/1 and the odd of getting the royal flush are 1/649740.
The odds of flopping a full house are 136:1.
25 to 1
46 to 1.