If we flip a coin four times, what's the probability we get an equal number of heads and tails?

Emily rolls a pair of standard dice. What is the probability that she gets a sum of 8 or at least one of the dice shows a 3?

Emily rolls a pair of standard dice. What is the probability that she gets a sum of 8 or at least one of the dice shows a 3?

A bag contains eight balls: 3 red, 3 green, and 2 blue. You sample three balls without replacement. What is the probability that you get a red ball, then a green ball, then a blue ball?