Sheldon and Ross

Question

Two balls each equally likely to be colored either red or blue, are put in an urn. At each stage one of the balls is randomly chosen, its color is noted, and it is then returned to the urn.if the first two balls chosen are colored red, what is the probability that

a>both balls in the urn are colored red

b>the next ball chosen will be red

how to solve this?

Comments

@prashant  jha 1

yes it is 2/3 for  the first Q.

And  5/6 for the second 

Can you explain how you solved it?

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Solved here https://math.stackexchange.com/questions/318362/conditional-probability-with-balls-in-an-urn

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Thanks @MiNiPanda for the link .