no idea, but eager to find out. I suspect it's quite a complex formula to work it out given that;

• Rummikub is a Rummy-style game played with tiles. It's basically 2 decks of cards (colors instead of suits) plus 2 jokers, for a total of 106 tiles.
• The game starts with each player drawing 14 tiles.
• total possible hands is 10^17. Choose 14) = 106! / ((106-14)! * 14!) =~ 10^17.

some of the odds for various things are posted here, as I said rather complex
https://math.stackexchange.com/questions/3710304/odds-of-an-unwinnable-game-of-rummikub