Sorry, they are all wrong. It's like this:


(3/50)(3/49)[6(44/48) + 3(4/48)] = 2.11%


+ .02% for the quads = 2.13%.


The first term in the brackets just gives Sklansky's 2 pair result. The other term is for 838 or 833 which only contributes a small amount. We only multiply by 3 in the second term since there are only 3 permutations. We multiply by 6 in the other case since we start we have permutations of 83x.