# Thread: Probability question (don't worry it's multiple choice)

1. ## 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.

2. Originally Posted by Mr Rayon
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.
$\displaystyle 2 \times 2 \times {3 \choose 1} + 2 \times 2 \times {3 \choose 2} + 2 \times 2 \times {3 \choose 3} = 28$.

And don't bump.

3. Originally Posted by mr fantastic
And don't bump.
I don't understand...what is bumping?

4. Originally Posted by Mr Rayon
I don't understand...what is bumping?
http://en.wikipedia.org/wiki/Bump_(Internet)