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# In blackjack, each card is worth a certain amount of points.

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Intern
Joined: 14 Feb 2013
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Schools: Duke '16
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In blackjack, each card is worth a certain amount of points. [#permalink]

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30 Apr 2013, 21:37
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Question Stats:

64% (02:28) correct 36% (01:48) wrong based on 87 sessions

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In blackjack, each card is worth a certain amount of points. Each numbered card is worth its numerical value, so for example a 7 is worth 7 points. Jacks, queens, and kings are all worth 10 points each, and aces are worth 1 point or 11 points at any time. Blackjack is played with a deck consisting of 13 cards (one of each of the numbers 2-10, one jack, one queen, one king, and one of ace) in each of four suits: clubs, diamonds, hearts, and spades. The player whose hand equals or comes closes to equalling 21 wins. A player may be dealt as many cards as he or she chooses, but any combination of cards summing to a number greater than 21 automatically loses.

If the odds against a certain event’s occurring are x/y, this means that oddsmakers consider there to be x scenarios in which the event does not occur and y scenarios in which it does. If the odds against a certain event are 13/10, what is the approximate probability that the event does happen, expressed as a percent?

1. 13%
2. 43%
3. 56%
4. 76%
5. 130%
[Reveal] Spoiler: OA

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Re: In blackjack, each card is worth a certain amount of points. [#permalink]

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01 May 2013, 00:37
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$$\frac{x}{y}=\frac{13}{10}$$

The probability we are looking for is$$\frac{x}{totCases}=\frac{x}{x+y}=\frac{10}{23}$$
This is a bit less than 50% so $$43%$$ is correct B.

This is a funny question! I spend a couple of minutes reading about the blackjack and then the question in completely unrelated...
Are you sure this is the original text?
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Joined: 14 Feb 2013
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Schools: Duke '16
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Re: In blackjack, each card is worth a certain amount of points. [#permalink]

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01 May 2013, 04:43
Zarrolou wrote:
$$\frac{x}{y}=\frac{13}{10}$$

The probability we are looking for is$$\frac{x}{totCases}=\frac{x}{x+y}=\frac{10}{23}$$
This is a bit less than 50% so $$43%$$ is correct B.

This is a funny question! I spend a couple of minutes reading about the blackjack and then the question in completely unrelated...
Are you sure this is the original text?

i have copied the same exact text as was in the question, i will post the pic of the question also later.
Even i had the same problem!!
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Re: In blackjack, each card is worth a certain amount of points. [#permalink]

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17 Jun 2013, 02:33
I play blackjack so i skipped the explanation part
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Re: In blackjack, each card is worth a certain amount of points.   [#permalink] 17 Jun 2013, 02:33
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