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Math Help - Probability Problem please help!

  1. #1
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    Probability Problem please help!

    Please help! I'm not really sure how to start solving this problem. A parking lot has 18 spaces in a row. 10 cars arrive, each of which requires one parking space and their drivers choose their spaces at random from among the available spaces. Auntie Em then arrives in her SUV, which requires 2 adjacent spaces. What is the probability that she is able to park?
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  2. #2
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    You need to find out how many ways to arrange ten 1ís and eight 0ís in such a way that no two 0ís are adjacent.
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  3. #3
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    Quote Originally Posted by Plato View Post
    You need to find out how many ways to arrange ten 1ís and eight 0ís in such a way that no two 0ís are adjacent.
    Following what Plato suggested...

    We place the ones such that,

    1_1_1_1_1_1_1_1_1 \color{red}{1}

    Notice \color{red}{1} is the only "1" that does not have to be fixed. and it can be in 1 of the 9 possible available spaces.

    Therefore the probability she can't find a spot is...
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  4. #4
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    Hello, sweeetcaroline!

    Am I reading the problem correctly?


    A parking lot has 18 spaces in a row. 10 cars arrive, each requiring one parking space.
    Their drivers choose their spaces at random from among the available spaces.

    Auntie Em then arrives in her SUV, which requires two adjacent spaces

    What is the probability that she is able to park?

    We are parking ten normal cars: . \blacksquare\;\blacksquare\;\blacksquare\;\blacksq  uare\;\blacksquare\;\blacksquare\;\blacksquare\;\b  lacksquare\;\blacksquare\;\blacksquare

    . . and one SUV: . \blacksquare\!\blacksquare


    After the ten cars are parked randomly, what is the probabiity
    . . that there is at least a pair of adjacent empty spaces?

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