Probability Questions

Question

This is a question that I am trying to help my niece with:

you want a new 2- door or 4- door car in black, blue or red. you may or may not get a CD player. how many different cars are possible

Answer 1

draw a tree diagram

2 door blue CD

no CD

red CD

no CD

4 door blue CD

no CD

red CD

no CD

from the tree you see there are eight different possibilities, or you can just use the counting principle and go 2 * 2 * 2 = 8