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Math Help - Matching cards.

  1. #1
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    Question Matching cards.

    A petrol station runs a promotion to advertise its new car wash. Each customer is given a pair of cards, each with a letter printed on it. there are a large number of different cards - each one has one of the symbols W, A, $ or H on it. Only 10% of the cards have a $ symbol, and the other three cards are equally likely. If the two cards are both the same the customer wins a prize.
    (a) What is the probability that a customer is given a W card and a H card?
    (b) What is the probability that a customer wins a prize?

    Please help......
    Last edited by mr fantastic; August 11th 2011 at 06:39 AM. Reason: Re-titled.
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  2. #2
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    Re: Find the probability (help please)

    There is 30% chance of getting a W and 30% chance of getting a H.

    Put together a table of all combinations for recieveing 2 cards, then find the probabilities.
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  3. #3
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    Re: Find the probability (help please)

    This means there is a 0.09 chance of getting a W and H (.3 x .3)
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  4. #4
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    Re: Find the probability (help please)

    Quote Originally Posted by hsetima View Post
    This means there is a 0.09 chance of getting a W and H (.3 x .3)
    I mean in total there is a .18 chance because it can either be W and H or H and W!
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