What are the odds?

In Caribbean poker you are delt only five cards out of a deck of 52.
What are the odds of drawing a straight flush?

I may be wrong but I get, ---

Odds for --

Royal straight = (48*49*50*51*52)/5! = 1 in (2598960/4)
Straight flush = (2598960/4)/9 = 1 in 72193.33333...

The only reason I ask is, I hit a queen high straight
flush @ the casino the other night and the payout was 10% of the jackpot.

To be fair the payout should be a little over 11% but who said casinos have to be fair!

Dan
.

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