This is for introductory stats. I don't understand how to approach these problems. Are they permutation or combination problems?

_ 2. Leibniz's mistake If we roll two [air dice, which is more likely: a sum of 11 or a sum of 12? Leibniz argued that a sum of 11 and a sum of 12 are equally likely. 4. A certain family has 6 children, consisting of 3 boys and 3 girls. Assuming that all birth orders are equally likely, what is the probability that the 3 eldest children are the 3 girls