Yes, use the binomial - see my post in the Examples section. Often it is easier to use complementary events when it reduces the amount of computation you have to do.
a) 1 - P(no 6s)
b) 1 - [ P(no 6s) + P(one 6) ]
c) 1 - [ P(no 6s) + P(one 6) + P(two 6s) ]
Just some advice - when you get tired, put the book away for a while and then come back to it. This stuff is hard enough when you're alert.....