Calculating odds of flopping a pair

[PJM1206]

According to Super System the odds of flopping a pair is approx 32%. This is where you hold AK and an Ace or King flops. So..... I tried to calculate this and came up with differnt answer approx 30% which is not good. Here is what I did:
I have AK so there are 6 cards left in the deck of 50 that will make my pair. So with that I used the following formula: 50 Choose 3 ( to get the number of possible 3 card flops which totaled to 15,180. Then I used 6 Choose 1 * 44 Choose 2 for a total of 5676. Here I am choosing 1 out of my possible 6 winning cards and 2 of the 44 loosing cards. Then 5767/15180= 30%..... What am I missing or is this correct.