Question

A bag contains 9 blue marbles and 1 green marble. What is the probability of drawing a blue marble followed by a green marble, without replacing the first marble before drawing the second marble?

Is the answer 1/9?

Answer 1

Pr(blue, green)=9/10*1/9

Answer 2

if you start with 10 marbles in total, 9 of them are blue. So we can say that is 9/10. Now you have 9 marbles left because you took one out. we know that we only have 1 green marble, so we can say it as 1/9.
9/10*1/9=
1/10

Answer 3

all of you are wrong >:|