At the school carnival, 50 sixth-grade, 30 seventh-grade, and 40 eighth-grade students bought tickets for the raffle. At the end of the night, Quincy draws out two names without replacement. What is the probability that she draws two-seventh-grade students? Please explain?
120 students 30 are seventh grade
1st draw is 7th grader 30 /120 chance
now there is 119 students left and 29 seventh graders
2nd draw 7th grader 29/119
30/120 * 29/119 = 29/476