there are 12 resistors. 3 are defective. if you choose 4 what is the probability that you'll get:

no defective resistors

1 defective resistor

3 defective resistors

15 insurance policies: 8 life, 5 auto, 2 home. if you choose 3, what is the probability that you'll get

all life policies

both home policies

1 of each

all auto policies

2 life and 1 auto policy

Help please.