So confused.........

#1
First one........
In a second grade class containing 14 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that both are girls?


second one........
In a second grade class containing 15 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that the second student chosen is a boy, given that the first one was a girl?

third one.......
Fizz fizz soda comes in two varieties, regular and diet. If a researcher has 8 boxes of each, how many ways can he select 2 boxes of each for a quality control test? :shakehead