Help please??

1. At the first tri-city meeting, there were 8 people from town A, 7 people from town B, and 5 people from town C. If the council consists of 5 people, find the probability of 2 from town A, 2 from town B, and 1 from town C.


a-.189


b-.038


c-.090


d-.076





2. In a certain college, 33% of the physics majors belong to ethnic minorities. Find the probability of the event from a random sample of 10 students who are physics majors. Seven or more belong to an ethnic minority.


a-.0028


b-.0032


c-.0185


d-.0154





3. The probability that a radish seed will germinate is .7. The gardener plants 20 seeds and she harvests 16 radishes.


a- .068


b- .571


c- .130


d- .075





4. If 3 balls are drawn from a bag containing 3 red and 4 blue balls, what is the expected number of red balls in the sample?


a- 1.29


b- 1.39


c- 1.54


d- .89

Help please??
ok so i anwsered on one of your different ones the last three but the first one is like this


P(2 from A and 2 from B and 1 from C)


= [(8C2) * (7C2) * (5C1] / (20C5)


= (28 * 21 * 5) / 15504


= 2940/15504


=.19