An urn contains 10 white balls and 5 blue balls. Draws are made repeatedly from the urn as follows. On each draw, a ball is drawn and its color noted; then it is replaced in the urn along with 3 more balls of its color.
1)Find the chance that the second ball drawn is blue.
2)Find the chance that the first ball drawn is blue, given that the second ball drawn is blue.

Question

An urn contains 10 white balls and 5 blue balls. Draws are made repeatedly from the urn as follows. On each draw, a ball is drawn and its color noted; then it is replaced in the urn along with 3 more balls of its color.
1)Find the chance that the second ball drawn is blue.
2)Find the chance that the first ball drawn is blue, given that the second ball drawn is blue.

anonymous · Answer

Can you draw a tree diagram for me?

anonymous · Answer

|dw:1366355370966:dw| I believe its something like this?