Calculating the probability of combined events

Maths

I roll a fair six-sided dice. What is the probability I roll a 4 or a 6?

What is the probability that both land on 2?

What is the probability that they land on the same number?

What is the probability that they land on different numbers?

What is the probability that their sum is greater than 3?

What is the probability of randomly selecting a student who did their homework?

Given that I select a girl, what is the probability that she didn't do her homework?