Mr. parietti needs two students to 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.

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

answer: for each 3 girls there is 2 boys . 3: 2

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