Chances of flopping a boat

[timex]

There are 3 of card x and 3 of card y remaining in the deck of 50, the first card has a 6/50 chance of being an x or y, the second card has a 5/49 and the third card has a 4/48 less the 3! *2 time when hit quads = 108/117600 or right around 1/1089 times.