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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? Which would be the correct answer?

(15x15)/(22x21)
(15x7)/(22x21)
7/21
7/22.

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This solution is comprised of a detailed explanation to answer what is the probability that both are girls.

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1. Probability that the first selected student is a girl, when there are 14 girls amongst 21 students = 14/21
Probability that the second selected student is a ...

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