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Holding AQ. What high card has highest prob on flop?

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  1. #1

    Default Holding AQ. What high card has highest prob on flop?

    I was talking to spoon on mIRC and was posed this question:
    [23:43] <spoonitnow> if you hold AQ
    [23:43] <spoonitnow> what's the most likely high card on the flop
    01[23:43] <Openside> K
    [23:43] <ZwiFTiBAF> buuuuurt
    [23:43] <ZwiFTiBAF> wrong
    [23:44] <spoonitnow> an ace is still the most likely high card
    [23:44] <spoonitnow> isn't that sick


    [23:50] <spoonitnow> chance of an a-high flop if we take an a and a q out of the deck is like (3/50)*(47/49)*(46/48)*3
    [23:51] <spoonitnow> ok so chance of a k-high flop under the same circumstances is
    [23:52] <spoonitnow> actually that's wrong
    [23:52] <spoonitnow> it should be
    [23:52] <spoonitnow> (3/50)*3, i think
    [23:52] <spoonitnow> anyway
    [23:52] <spoonitnow> so here comes the K-high flop train
    [23:53] <spoonitnow> (4/50)*(46/49)*(45/48)*3 = 0.21
    [23:53] <spoonitnow> which should be lower than (3/50)*3 = 0.18

    I like to figure things out for myself and hate it when i can't. I am missing something, I cant figure why A has the highest prob.
    Here is my logic: we hold AQ
    Flop can come Axx, xAx or xxA
    Prob. of hitting at least one A on flop = 3/50+3/49+3/48 = 0.18


    Now prob of the flop hitting a K and no A is
    K, no A, noA + no A, K, no A + no A, no A, K
    = (4/50*46/49*45/48)+(47/50*4/49*45/48)+(47/50*46/49*4/48) = 0.21

    So to me hitting a K and no A is higher prob. than hitting an A on flop.

    Damn it, where am i going wrong?
    Last edited by Openside; 08-21-2010 at 03:28 PM.
  2. #2
    I might be barking up the wrong tree, but It it like a trick question?

    Maybe its not to do with maths.


    Quote Originally Posted by Openside View Post
    I was talking to spoon on mIRC and was posed this question:
    [23:43] <spoonitnow> if you hold AQ
    [23:43] <spoonitnow> what's the most likely high card on the flop

    I dont see how the K can be the most likely High card, because the J is equally most likely and this is also a high card.

    Its like saying , higher cards have more chance than low cards of landing in the flop.
  3. #3
    Quote Originally Posted by celtic123 View Post
    I might be barking up the wrong tree, but It it like a trick question?

    Maybe its not to do with maths.





    I dont see how the K can be the most likely High card, because the J is equally most likely and this is also a high card.

    Its like saying , higher cards have more chance than low cards of landing in the flop.
    No i dont think its a trick question. Think of it as "which has a higher prob. of hitting the flop A or K and being high card?"
  4. #4
    Quote Originally Posted by Openside View Post
    Think of it as "which has a higher prob. of hitting the flop A or K and being high card?"


  5. #5
    Quote Originally Posted by Openside View Post
    Now prob of the flop hitting a K and no A is
    K, no A, noA + no A, K, no A + no A, no A, K
    = (4/50*46/49*45/48)+(47/50*4/49*45/48)+(47/50*46/49*4/48) = 0.21

    So to me hitting a K and no A is higher prob. than hitting an A on flop.

    Damn it, where am i going wrong?
    Why does it matter what order they're in? Just find the probability of a king flopping and then subtract it by the probability of an ace hitting the other two cards. (4/50+4/49+4/48)-[(3/49)+(3/48)]?(0.8+0.816+0.833)-[(0.0612)+(0.0625)=24.5%-12.37%
    probability of a king being the high card should be something like 12%
  6. #6
    spoonitnow's Avatar
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    There are K-high flops and there are A-high flops. Which is most likely if you hold AQ?
  7. #7
    spoonitnow's Avatar
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    Btw I f'ed up the original question, K-high flops are the most likely in that scenario. Meant to ask if we hold AK which is most likely, an A-high flop or Q-high flop.

    If we hold AQ then A/K-high flops are of similar likelihood.

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