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

• November 17th 2008, 10:28 PM
Mr Rayon
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.
• November 19th 2008, 03:03 AM
mr fantastic
Quote:

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.

$2 \times 2 \times {3 \choose 1} + 2 \times 2 \times {3 \choose 2} + 2 \times 2 \times {3 \choose 3} = 28$.

And don't bump.
• March 7th 2009, 10:36 PM
Mr Rayon
Quote:

Originally Posted by mr fantastic
And don't bump.

I don't understand...what is bumping?
• March 8th 2009, 01:30 AM
mr fantastic
Quote:

Originally Posted by Mr Rayon
I don't understand...what is bumping?

http://en.wikipedia.org/wiki/Bump_(Internet)