Find the probability for the experiment of drawing two marbles (without replacement) from a bag containing three green, five yellow, and four red marbles such that both marbles are yellow.

Question

mathstudent55 · Answer

What is the total number of marbles?
How many are yellow?

anonymous · Answer

5/12 is not an answer choice.

mathstudent55 · Answer

One thing at a time.
First step, there are 12 marbles in total, and 5 yellow, right?

mathstudent55 · Answer

The probability of draing 1 yellow marble is then 5/12.

mathstudent55 · Answer

Now since there is no replacement, after drawing one yellow marble, how many marbles are there in total and how many are yellow of the reaminiing marbles?

anonymous · Answer

5/12+4/11=103/132 which still isn't an answer
choices:
a.5/33
b.25/144
c.25/132
d.2/5
e.5/7