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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A sample which is having 25.00ml of a 0.500M weak acid (HA) with a Ka = 1.0X 10^-5is titrated with 1.00M NaOH. The indicator chosen for the titration has a p Kind = 11.0, and the titration was carried out at25oC.
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