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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? Which would be the correct answer
(14x14)/(21x21)
(14x13)/(21x20)
(14x7)/(21x21)
(7x7)/(21x21)

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? Whic would be the correct answer?
(15x15)/(22x21)
(15x7)/(22x21)
7/21
7/22

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