概率問題 20points

1)medicine bag contains 2 white pills,3 black pills and 4 red pills.If 3 pills are drawn in succession with replacement.Find the probability.
a)All are red
b)1st :white,2nd:black,3rd:red
c)None are black
d)Two black and one red

2)In a medicine bag ,there are 3 pills ,4 blue pills and 3 orange pills.Two pills are taken out one by one with repalcement.What is the probability that
a) both pills are blue,
b)at least one pill is red