Question

Please HELP !!!
Probability Question :
Out of every four seeds put into soil, three germinate into plants. Each plant is equally likely to give a white flower , a pink flower and a yellow flower. Find the probability that
(a)a seed (i) gives a white flower
(ii) does not give a pink flower
(b) two seeds give different coloured flowers
(c) at least one of three seeds gives a yellow flower