SOLUTION: Of a class of 25 students, 18 have brown eyes. If 2 students are chosen at random, what is the probability that both students have brown eyes.

Question 254698: Of a class of 25 students, 18 have brown eyes. If 2 students are chosen at random, what is the probability that both students have brown eyes.
Found 3 solutions by edjones, drk, solver91311:
Answer by edjones(8007)   (Show Source): You can put this solution on YOUR website!
nCr=n!/((n-r)!r!) Combination of things r at a time.
.
18C2/25C2
=153/300
=.51
.
Ed
Answer by drk(1908)   (Show Source): You can put this solution on YOUR website!
The probability is
18c2*(7c0) / 25c2 = 0.51
We include the 7c0 to represent the 7 kids not with brown eyes and we want 0 of them.
Answer by solver91311(24713)   (Show Source): You can put this solution on YOUR website!

You can do your own arithmetic.

John

RELATED QUESTIONS
In a class, 50% of the students have brown hair, 25% have black hair, 20% have blonde... (answered by opeodu)
Of 10 girls in a class, 3 have brown eyes. 2 girls are chosen at random. Find the... (answered by stanbon)
There are 12 students with brown eyes, 9 with blue eyes, and 2 with hazel eyes. If 3... (answered by ewatrrr)
A class is collecting data on eye color and gender. They organize the data they collected (answered by stanbon)
in a certain town, 40% of the people have brown hair, 25% have brown eyes,and 15% have... (answered by oscargut)
Two students from a class of 12 boys and 8 girls are chosen at random. What is the... (answered by FrankM)
A class contains 20 men and 40 women of which half the men and half the women have brown... (answered by natolino_2017)
There are 20 students in a class. Six of them have blue eyes and nine have brown eyes.... (answered by stanbon)
1) A Class contains 10 men and 20 women of which half of the men and half of the women... (answered by stanbon)