
PROB/STAT help
1.There are 12 apples in a bag. Four of them have worms in them. Two apples are pulled from the bag at random, find the probability that neither has a worm in it.
2.A company car pool consists of 40% fords, 20% chryslers and 40% Hondas. While each honda has a passenger side airbag, only 50% of the fords and 60% of the chryslers do. A car is selected at random from the car pool. Determine the probability that it has a passenger side airbag.
i know these are easy but, this class is hard any help will help:)

How many ways can one pick two ‘good’ apples?
How many ways can one pick two any apples?
Now divide.

let A = good apple. 8/12= P(A)
b = bad apple.4/12 =P(A^c)
p(BA)= probability second apple is bad one given that the first apple is good =4/12
p(BA^c)=8/11 eleven it is not but back at the bag
p(B^cA)= 7/11 eleven it is not but back at the bag
p(B^cA^c) =3/11 eleven it is not but back at the bag
p(B) =P(BA)P(A)+p(B^cA)P(A^c)
= 4/12.8/12+7/11.4/12=