In a game of checkers, there are 12 red game pieces and 12 black game pieces. julio is setting up the board to begin playing. what is the probability that the first two checkers he pulls from the box at random will be two red checkers?

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)