Question

Mr. Parietti needs two students to help him with a science demonstration for his class of 18 girls and 12 boys. He randomly chooses one student who comes to the front of the room. He then chooses a second student from those still seated. What is the probability that both students chosen are girls? Enter your answer as a fraction in the form a/b (for example 2/3, 5/7) or as an integer.

Answer 1

Answer:1/870

Step-by-step explanation:

The total number of student in Mr parietti class is 30 (18girls and 12boys). If a student is first chosen at random from the class. The probability of choosing 1 student out of 30 will be 1/30.

He then chose another student without replacing the first, the probability of choosing that second lady will be 1/29 (since the remaining students are 29).

the probability that both students chosen are girls will be 1/30×1/29 = 1/870