SOLUTION: in a bag of 4 yellow and 8 blue marbles. three are selected at random without replacement. what is the probabilitlity that all 3 are yellow or all 3 are blue?

Question 414461: in a bag of 4 yellow and 8 blue marbles. three are selected at random without replacement. what is the probabilitlity that all 3 are yellow or all 3 are blue?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
in a bag of 4 yellow and 8 blue marbles. three are selected at random without replacement. what is the probabilitlity that all 3 are yellow or all 3 are blue?
-------
P(3 blue) = 8C3/12C3
---
P(3 yellow) = 4C3/12C3
-----
P(3 blue or 3 blue) = [8C3 + 4C3]/12C3 = [56 + 4]/[12*11*10/6]
= [6*60/[1320] = 0.273
===============================
Cheers,
Stan H.
RELATED QUESTIONS
In a bag are 4 yellow and 8 blue marbles. 3 are selected at random without replacement.... (answered by jim_thompson5910)

A bag contains 4 blue marbles and 5 red marbles. If 2 marbles are selected at random... (answered by scott8148)

In a bag are 4 green, 8 blue, and 5 red marbles. 2 are selected at random without... (answered by scott8148)

A bag of marbles contains 2green one blue and 3red. If 2 marbles are selected at random... (answered by ewatrrr)

A bag has 10 blue marbles and 8 yellow marbles. Half of the yellow marbles are made of... (answered by ewatrrr)

2. A bag contains 13 marbles: 6 red ones, 4 blue ones, and 3 yellow ones. Suppose that... (answered by stanbon)

A bag contains 10 red, 3 white and 6 blue marbles. Two are selected at random without... (answered by stanbon)

A box contains 8 red marbles, 6 green marbles, and 9 yellow marbles. 4 marbles are... (answered by greenestamps)

A bag contains 8 red marbles, 7 blue marbles, 10 white marbles and 9 yellow marbles. You... (answered by ewatrrr)