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A gambler began playing blackjack with $110 in chips. After

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A gambler began playing blackjack with $110 in chips. After [#permalink] New post 22 Mar 2005, 03:01
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A gambler began playing blackjack with $110 in chips. After exactly 12 hands, he left the table with $320 in chips, having won some hands and lost others. Each win earned $100 and each loss cost $10. How many possible outcomes were there for the first 5 hands he played? (For example, won the first hand, lost the second, etc.)

(A) 10
(B) 18
(C) 26
(D) 32
(E) 64
[Reveal] Spoiler: OA
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 [#permalink] New post 22 Mar 2005, 04:25
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I guess! (C)
well the algebra first -> 110 (starting cash)+100x (n of wins)-10*(12-x)=320 -> solve and get x=3
if wins=3/12
if losses= 9/12
there can be max 3 wins out of 5 hands
alas, I'm not sure about how to turn out the outcomes
I think
5c0+5c1+5c2+5c3=26
that is 0 wins/1 win/2 wins/3 wins
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 [#permalink] New post 22 Mar 2005, 05:08
I got the algebra bit correct too: 3 Wins and 9 losses.

I'm unsure on how to go about the arranging part. thearch, I guess your approach looks fine and C should be the answer.

Good question, ywilfred!
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 [#permalink] New post 22 Mar 2005, 08:49
i would have to go with C also because he can only have 3 wins and 9losses in 12 rounds
so in 5 turns the possibilities are limited to getting no wins, 1 win, 2 wins and all 3 wins.
26
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 [#permalink] New post 22 Mar 2005, 09:47
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"C"

If X is number of wins and Y num of losses then

100X - 10Y = 210

10X-Y = 21......only when Y = 9 and X = 3 it satisfies....so we have 3 wins and 9 losses.

for first 5, we can have the following:

0 wins 5 losses = 1 way
1 win and 4 losses = 5C1 = 5
2 wins and 3 losses = 5C2 = 10
3 wins and 2 losses = 5C3 = 10

Add total ways = 26 ways
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 [#permalink] New post 25 Mar 2005, 10:04
Good job thearch. You can also do it this way: 2^5-5(four wins)-1(five wins)=26.
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Re: A gambler began playing blackjack with $110 in chips. After [#permalink] New post 24 Feb 2014, 02:18
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Re: [#permalink] New post 11 Mar 2014, 09:28
What about arrangement of these outcomes, don't we have to arrange their sequence?
I applied permutation instead of combination, got the wrong answer.
Kindly help

Thanks! :)
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Re: Re: [#permalink] New post 11 Mar 2014, 09:59
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Expert's post
ShantnuMathuria wrote:
What about arrangement of these outcomes, don't we have to arrange their sequence?
I applied permutation instead of combination, got the wrong answer.
Kindly help

Thanks! :)


A gambler began playing blackjack with $110 in chips. After exactly 12 hands, he left the table with $320 in chips, having won some hands and lost others. Each win earned $100 and each loss cost $10. How many possible outcomes were there for the first 5 hands he played? (For example, won the first hand, lost the second, etc.)

(A) 10
(B) 18
(C) 26
(D) 32
(E) 64

The gambler started with $110 and left with $320, thus he/she in 12 hands won $320 - $110 = $210:

100W - 10L = 210;
100W - 10(12-W) = 210 (since Wins + Loss = 12) --> W = 3.

So, we have that out of 12 hands the gambler won 3 hands and lost 9.

For the first 5 hands played there could be the following outcomes:
WWWLL --> 5!/(3!2!) = 10 ways this to occur (for example, WWWLL, WWLWL, WLWWL, ...);
WWLLL --> 5!/(3!2!) = 10 ways this to occur;
WLLLL --> 5!/(4!1!) = 5 ways this to occur;
LLLLL --> only 1 way this to occur.

Total = 10 + 10 + 5 + 1 = 26.

Answer: C.
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Re: A gambler began playing blackjack with $110 in chips. After [#permalink] New post 01 Apr 2014, 19:44
Can someone explain where I can learn more about this: WWWLL --> 5!/(3!2!) = 10 Why do you divide here. I think i get the logic, but how do you know to choose 3! and 2!, and how can I know when to do this.
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Re: A gambler began playing blackjack with $110 in chips. After [#permalink] New post 01 Apr 2014, 20:11
Expert's post
frenchwr wrote:
Can someone explain where I can learn more about this: WWWLL --> 5!/(3!2!) = 10 Why do you divide here. I think i get the logic, but how do you know to choose 3! and 2!, and how can I know when to do this.


You arrange 5 distinct objects in 5! ways.

But if some of them are identical, you need to divide the total arrangements by the factorial of that number: Say you have total n objects out of which m are identical.
Total number of arrangements = n!/m!

e.g. Out of 5 objects, if 2 are identical, number of arrangements = 5!/2! (because we don't have as many arrangements as before now.)

Say 5 objects are A, B, C, D and D. There are 2 identical Ds.
5! gives the arrangements of 5 distinct objects(e.g. ABCDE, ABCED are two diff arrangements) but if two letters are same, ABCDD is same as ABCDD (we flipped the D with the other D). Hence the number of arrangements are half in this case: 5!/2!

Similarly, if you have 5 letters such that three of them are same and another 2 are same, the number of arrangements is given by 5!/(3!*2!) as is the case with WWWLL.

Our Combinatorics book discusses this concept as well as other GMAT relevant concepts in detail. You can take a look at it here: http://www.amazon.com/Veritas-Prep-Stat ... ds=veritas
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Re: A gambler began playing blackjack with $110 in chips. After   [#permalink] 01 Apr 2014, 20:11
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