I'm sure there has been at least a few times a professional has folded pocket aces, but rather than speculate on that let's look at what the questions is likely asking.
Is there ever a reason to fold pocket aces pre-flop in Texas Hold'em?
Pocket aces have a positive expected value, thus in the long-run make money. This holds true for rings games and tournaments. The greater the number of people that enter the pot the lower the chances are that aces will win -- but this is true of any cards. Even with more people in the pot the expected value is positive. Given that it would be a wrong decision to fold aces preflop in a money game.
A tournament holds a special status however. If you call your aces all-in and lose, you are out of the tournament. Though generally you'd take the risk since generally you play enough tournaments that one loss is not such a big deal. However, if this tournament is particularly prestigious or valuable you might want to remain in.
So consider if you are on the button with AA and 3 people before you have moved all in -- and all of them have you covered, and are all tight players, that is their all-in means KK, AA, QQ, or AK. This would mean your chances of winning are relatively small, and a good chance of a tie to split. In this case you could think about not calling...
...then again, winning would propel you so far in the front with a massive chip lead most professionals would probably still call.
.16837% . Just think of it as 1/10th of one %.
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FLOP
flop
With a pocket pair there are only 48 out of 19600 flops which would give you four of a kind on the flop, so 0.24%. If you go to showdown those extra two cards bring the chance up to about 0.84%
not flop, blockbluster.........
flop
flop
flop.
In a master-slave flip-flip arrangement, the master flip-flop determines its state on one clock edge, while the slave flip-flop determines its state on the following clock edge. This way, the end-to-end output does not ever change on any one clock edge, so no race condition is possible.
A jump from the high dive often ends in a flop (aka belly flop).
theory of s-r flip flop