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Math Help - Probability question (don't worry it's multiple choice)

  1. #1
    Member Mr Rayon's Avatar
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    Smile Probability question (don't worry it's multiple choice)

    A Whoppa pizza base is made using one of 2 types of cheese and one of 2 toppings. Up to 3 additional toppings are available at extra cost. The number of different Whoppa pizzas that can be made containing at least one additional topping is:

    A) 12 B) 16 C) 24 D) 28 E) 20


    I know the answer to this question but I don't how you get the answer. So, I would like to see it done correctly showing any working out.
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  2. #2
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    Quote Originally Posted by Mr Rayon View Post
    A Whoppa pizza base is made using one of 2 types of cheese and one of 2 toppings. Up to 3 additional toppings are available at extra cost. The number of different Whoppa pizzas that can be made containing at least one additional topping is:

    A) 12 B) 16 C) 24 D) 28 E) 20


    I know the answer to this question but I don't how you get the answer. So, I would like to see it done correctly showing any working out.
    2 \times 2 \times {3 \choose 1} + 2 \times 2 \times {3 \choose 2} + 2 \times 2 \times {3 \choose 3} = 28.

    And don't bump.
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  3. #3
    Member Mr Rayon's Avatar
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    Quote Originally Posted by mr fantastic View Post
    And don't bump.
    I don't understand...what is bumping?
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  4. #4
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    Quote Originally Posted by Mr Rayon View Post
    I don't understand...what is bumping?
    http://en.wikipedia.org/wiki/Bump_(Internet)
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