Give out the math papers
In second grade class containing 12 girls and 9 boys, 2 students are chosen at random to give out the math papers. What is the probability that both are girls.
a. (4/7)*(4/7)
b. (4/7)*(11/20)
c. (4/7)*(3/5)
d. (3/7)*(2/5)
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