questions:

a) We have 10 marbles in a bag: 7 red, 2 blue, 1 yellow. We randomly pull two marbles, with replacement. Find the expected value of the number of blue marbles pulled.

b) We have 10 marbles in a bag: 7 red, 2 blue, 1 yellow. We randomly pull two marbles, without replacement. Find the expected value of the number of blue marbles pulled.

-I can't figure this one out without being given an actual value on the blue marbles, any suggestions?