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The Aam-Aadmi Party

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Aman verma GMAT Destroyer! Default Avatar
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The Aam-Aadmi Party Post Sat Nov 30, 2013 5:36 am
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  • Lap #[LAPCOUNT] ([LAPTIME])
    Q:In the upcoming Delhi Elections only two major parties are fighting the elections-The Aam-Aadmi Party headed by Arvind kejriwal and The Aam-Aurat party headed by Dr. Sanjay HarshaVardan. 45% of the population support the Aam-Aadmi Party and 30% of the population support The Aam-Aurat Party and 20% of the population support both the parties. One citizen is selected at random from the population named Aman Verma. Find the probability that he supports the Aam-Admi party if it is known that he supports the Aam-Aurat Party. [Edited: Missing information inserted at the end of the third line]

    (A)1/3

    (B)2/3

    (C)5/6

    (D)4/7

    (E)5/9

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    Last edited by Aman verma on Sat Nov 30, 2013 9:05 am; edited 1 time in total

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    Post Sat Nov 30, 2013 8:09 am
    Aman verma wrote:
    Q:In the upcoming Delhi Elections only two major parties are fighting the elections-The Aam-Aadmi Party headed by Arvind kejriwal and The Aam-Aurat party headed by Dr. Sanjay HarshaVardan. 45% of the population support the Aam-Aadmi Party and 30% of the population support The Aam-Aurat Party. One citizen is selected at random from the population named Aman Verma. Find the probability that he supports the Aam-Admi party if it is known that he supports the Aam-Aurat Party.

    (A)1/3
    (B)2/3
    (C)5/6
    (D)4/7
    (E)5/9
    Hi Aman,

    As it stands, there is not enough information to answer this question.

    Cheers,
    Brent

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    Brent Hanneson – Founder of GMATPrepNow.com
    Use our free video course along with Beat The GMAT's free 60-Day Study Guide

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    Aman verma GMAT Destroyer! Default Avatar
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    Post Sat Nov 30, 2013 9:09 am
    Brent@GMATPrepNow wrote:
    Hi Aman,

    As it stands, there is not enough information to answer this question.

    Cheers,
    Brent
    Hi Brent,

    Yes, there was an information missing at the end of the third line, which I have inserted in the original post.I was unable to highlight the missing part as I don't know how to do that. Regret the error.

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    aalradadi Just gettin' started! Default Avatar
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    Post Sat Nov 30, 2013 9:48 am
    What was the answer? And did they wrote an explanation ?

    Post Sat Nov 30, 2013 10:03 am
    Aman verma wrote:
    Q:In the upcoming Delhi Elections only two major parties are fighting the elections-The Aam-Aadmi Party headed by Arvind kejriwal and The Aam-Aurat party headed by Dr. Sanjay HarshaVardan. 45% of the population support the Aam-Aadmi Party and 30% of the population support The Aam-Aurat Party and 20% of the population support both the parties. One citizen is selected at random from the population named Aman Verma. Find the probability that he supports the Aam-Admi party if it is known that he supports the Aam-Aurat Party.

    (A)1/3
    (B)2/3
    (C)5/6
    (D)4/7
    (E)5/9
    We can solve this question using the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it.
    Here, we have a population of voters, and the two characteristics are:
    - pro Aam-Aadmi or not pro Aam-Aadmi
    - pro Aam-Aurat or not pro Aam-Aurat

    To learn more about this technique, watch our free video: http://www.gmatprepnow.com/module/gmat-word-problems?id=919

    Since the question does not ask us to find specific numbers of voters, we can assign a "nice" value to the entire population. Let's say that there are 100 voters altogether.

    So, we can set up our diagram as follows:


    45% of the population support the Aam-Aadmi Party and 30% of the population support The Aam-Aurat Party
    We can add this information to our diagram.



    20% of the population support both the parties
    We'll add that information as well.


    At this point, we can determine the number of voters in each box.


    Find the probability that he supports the Aam-Aadmi party if it is known that he supports the Aam-Aurat Party.

    So, Aman verma is one of the 30 Aam-Aurat supporters.
    Of the 30 Aam-Aurat supporters, 20 also support Aam-Aadmi
    So, the required probability = 20/30 = 2/3 = B

    ---------------------------------------------

    Here are some additional practice questions that can be solved using the Double Matrix Method:
    - http://www.beatthegmat.com/mba/2011/05/05/random-double-matrix-question-1
    - http://www.beatthegmat.com/mba/2011/05/09/random-double-matrix-question-2
    - http://www.beatthegmat.com/mba/2011/05/16/random-double-matrix-question-3
    - http://www.beatthegmat.com/ds-quest-t187706.html
    - http://www.beatthegmat.com/overlapping-sets-questions-t183320.html
    - http://www.beatthegmat.com/finance-majors-non-finance-majors-overlapping-set-question-t167425.html
    - http://www.beatthegmat.com/ds-french-japanese-t222297.html
    - http://www.beatthegmat.com/sets-t269449.html#692540
    - http://www.beatthegmat.com/in-costume-for-halloween-t269355.html#692116

    Cheers,
    Brent

    _________________
    Brent Hanneson – Founder of GMATPrepNow.com
    Use our free video course along with Beat The GMAT's free 60-Day Study Guide



    Last edited by Brent@GMATPrepNow on Sat Nov 30, 2013 11:50 am; edited 1 time in total

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    Aman verma GMAT Destroyer! Default Avatar
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    Post Sat Nov 30, 2013 11:15 am
    OA(B)2/3.

    Good Night!

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    Post Sat Nov 30, 2013 11:52 am
    Ha - after all of that work, I didn't interpret my own diagram correctly Smile
    I edited the last sentence accordingly.

    Cheers,
    Brent

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    Use our free video course along with Beat The GMAT's free 60-Day Study Guide

    GMAT Prep Now's 35-hour (500+ videos) course is 100% FREE. Use our free course in conjunction with Beat The GMAT’s FREE 60-Day Study Guide and reach your target score in 2 months!
    telberrak Just gettin' started! Default Avatar
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    Post Fri May 16, 2014 1:27 am
    Event A : pro Aam-Aadmi
    Event B : pro Aam-Aurat

    pick up a pro Aam-Aadmi knowing he's a pro Aam-Aurat is P(A|B)

    Probability of A knowing B (non-independent events) is P(A|B) = P(A and B)/P(B)
    P(A and B) = 20%
    P(B) = 30%

    ==> P(A|B) = 20%/30% = 2/3

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