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24 October, 02:05

You are a contestant on the all new "Let's Make A Deal" with Montana Hill. Montana brings you up to play the 6 doors game. Behind one door is $1200. Behind another door is $120. Behind the other 4 doors is $0. The game works just like Monty's version in that the prizes are randomly distributed and, after you choose a door, Montana will open a door (which will always hide $0) and give you the opportunity to switch your choice. (A) What is your probability of getting a prize (of either $1200 or $120) if you switch your guess after Montana opens one door? (B) After playing the game, Montana gives you the opportunity to buy a chance to play again. What is the fair price you should be willing to pay to play this game?

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  1. 24 October, 04:46
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    A. The probability of getting a prize (of either $1200 or $120) if you switch your guess after Montana opens one door is 0.6

    B. The fair price you should be willing to pay to play this game is $264

    Step-by-step explanation:

    A. According ot the given data Let A be the event of wining a prize

    Let B the event of losing a prize

    P (A) = 2/6C1=2/6=1/3

    P (B) = 1-P (A) = 2/3

    Hence, after opening the door:

    P (A I B) = P (A∩B) / P (A)

    P (A∩B) = 2/5

    P (A I B) = 2/5/2/3

    P (A I B) = 0.6

    The probability of getting a prize (of either $1200 or $120) if you switch your guess after Montana opens one door is 0.6

    B. The fair price you should be willing to pay to play this game=∑ (expected prize) probability

    The fair price you should be willing to pay to play this game=1200*1/5 + 120*1/5 + 0*3/5

    The fair price you should be willing to pay to play this game=$264

    The fair price you should be willing to pay to play this game is $264
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