Question

There are 4 blue marbles and 3 red marbles in a bag. You randomly pick one marble, keep it, and then pick a second marble. What is the probability that you will pick two blue marbles?

Answer 1

2/7 ?

Answer 2

no

Answer 3

8/21 ? @satellite73

Answer 4

oh there you are

Answer 5

what is the probability that the first one selected is blue?

Answer 6

4/7 ?
@satellite73

Answer 7

yes
now that marble is in your pocket
what is the probability that the second marble selected is blue now that one blue marble is gone?

Answer 8

oh heavens, i see you had the right answer to begin with!!

Answer 9

the same right because everytime i take one out i put it back in there ? @satellite73

Answer 10

and me, like a dope, said "no"
so sorry

Answer 11

no now it is \(\frac{3}{6}=\frac{1}{2}\) because one blue marble is gone and there are now 3 blue and 6 total
so you were right
\[\frac{4}{7}\times \frac{1}{2}=\frac{2}{7}\]

Answer 12

you were right, sorry to waste your time
i misread blue for red
you had it on the first try

Answer 13

its cool so its 2/7

Answer 14

yeah

Answer 15

thank you

Answer 16

lol for what it is worth, you are welcome