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what is the probability of getting full house (for example:

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what is the probability of getting full house (for example: [#permalink] New post 14 Feb 2005, 18:32
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what is the probability of getting full house (for example: three kings and two jacks) from a deck of cards?
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 [#permalink] New post 14 Feb 2005, 18:35
Not too sure what full house is. Does the 5 cards all have to be pictures ?? (as in, 3 queens, 2 jacks, or 3 jacks 2 queens)
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 [#permalink] New post 14 Feb 2005, 18:37
Total outcome: c(54,5)
Getting full house: C(13,2)*C(3,2)*C(3,2)
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 [#permalink] New post 14 Feb 2005, 18:51
HongHu wrote:
Total outcome: c(54,5)
Getting full house: C(13,2)*C(3,2)*C(3,2)


try again.

Buddy goodluck for tomorrow's exam.

Last edited by MA on 19 Feb 2005, 22:47, edited 1 time in total.
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 [#permalink] New post 14 Feb 2005, 20:44
MA wrote:
HongHu wrote:
Total outcome: c(54,5)
Getting full house: C(13,2)*C(3,2)*C(3,2)


try again.

BODY goodluck for tomorrow's exam.


I can't give the answer but I am wondering Hong Hu, why c(54,5) ? not c(52,5) for total outcome ?

For the full house we must consider the fact that if you have 3 kings first, you have to exclude the kings from the potential pair of king in the probability for the pair of the remaining 2 card because it would be impossible, 4 kings maximum in the game and not 5... :wink:
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 [#permalink] New post 14 Feb 2005, 22:17
MA wrote:
Antmavel wrote:
HongHu wrote:
I can't give the answer but I am wondering Hong Hu, why c(54,5) ? not c(52,5) for total outcome ?


a valid question?


:oops: by re-reading myself I admit that my remark was not very clear, I write again now :

HongHu, in your post you've written c(54,5) as the formula to calculate the total outcome. why didn't you choose c(52,5) for this formula ?

Hope now it's clear for everybody :P
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Re: PS [#permalink] New post 15 Feb 2005, 01:18
MA wrote:
what is the probability of getting full house (for example: three kings and two jacks) from a deck of cards?


now lets analyze...wat we want is five cards. So our total outcomes are:

52 52!
C = --------- = 2598960
5 47!*5!


Now what we want is possible outcomes for (1)3 similar and (2)2 similar cards.

(1)Firstly lets look at possibility of getting three similar cards. Definitely, three similar cards can come from four similar cards...not more than that. so the number of similar cards for a quartlets is:

4
C = 4 possibilities for getting 3 similar cards from a single type.
3

since there are 13 different types so we add 4 13 times or 4*13 = 52. Thus we have 52 possible ways of having three similar cards.

(2)Now for getting two similar cards.

4
C = 6 possiblities of two similar cards of a type.
2
And 6*12 = 72 for all 12 types, since one has been used in above 3 cards.

Now for the big equation which is:

52*72 3744 ~ 144
Probability = ------------ = ------------ = --------
2598960 2598960 10000

I dont think u wud eva get such a question on GMAT...since its calculation is hectic.
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 [#permalink] New post 18 Feb 2005, 11:10
MA wrote:
Antmavel wrote:
I can't give the answer but I am wondering Hong Hu, why c(54,5) ? not c(52,5) for total outcome ?


a valid question?


I was more used to counting the two jokers included. :-D C(52, 5) is good. :)
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 [#permalink] New post 19 Feb 2005, 22:30
HongHu wrote:
I was more used to counting the two jokers included. :-D C(52, 5) is good. :)


you r (still) missing the only and gr8 joker :lol:

anyway,
prob of getting a full house =(13c3 x 12c2 x 4c3 x 4c2)/(52c2)
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 [#permalink] New post 02 Mar 2005, 10:38
MA wrote:
HongHu wrote:
I was more used to counting the two jokers included. :-D C(52, 5) is good. :)


you r (still) missing the only and gr8 joker :lol:

anyway,
prob of getting a full house =(13c3 x 12c2 x 4c3 x 4c2)/(52c2)


Please spell out the numerator portion of your answer
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 [#permalink] New post 02 Mar 2005, 12:17
MA wrote:
HongHu wrote:
Total outcome: c(54,5)
Getting full house: C(13,2)*C(3,2)*C(3,2)


try again.

Buddy goodluck for tomorrow's exam.


Hey I can't believe that I made a crucial typo. :-D
It should be C(13,2)*C(3,2)*C(3,1). :)
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 [#permalink] New post 02 Mar 2005, 12:21
MA wrote:

you r (still) missing the only and gr8 joker :lol:

anyway,
prob of getting a full house =(13c3 x 12c2 x 4c3 x 4c2)/(52c2)


:lol:

Ok let's compare numbers. I don't know why you'd do it your way. But my number would be: 13*6*3*3
Oh well that should be good enough for comparison. Don't want to multiply them out. :-D
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 [#permalink] New post 02 Mar 2005, 14:38
I agree with Honghu's answer and I'll try to explain a bit further.

Total outcomes: 52C5 --> we have to select 5 out of 52 cards(excluding jokers)
Favorable outcomes:
step#1: Select 2 out of 13 sets (2,3,4,J,Q, etc...) --> 13C2
step#2: Select 2 out of set of 1st set of 4 cards given that 1st card was already picked. This will ensure that we pick a card different from the other set of 4 cards and this will be part of the group of 3 for the flush--> 3C2
step#3: Select 1 out of set of 2nd set of 4 cards given that 1st card was already picked. This is part of the pair in the flush --> 3C1

Answer is [13C2*3C2*3C1] / 52C5
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 [#permalink] New post 04 Mar 2005, 03:17
Paul, I couldn't understand the concept of the question initially. But once I read your explanation, I got it. Let me tell you, this was an awesome explaination. You really make complicated things simple by writing them in simple english with emphasis on imp phrases.

It helps a lot.

Thanks
Vijo.
  [#permalink] 04 Mar 2005, 03:17
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