My question is, just say you are given the following events:

A = The first roll is a six

B = The last roll is a six

C = The first and last rolls are the same

D = The sum of ten rolls is eleven or less

Are events A and B independent?

Are events A and C independent?

Are events A and D independent?

If all the answers are yes, can someone explain why? I am a bit confused with the concept here.