Cup of marbles
Ash has a cup containing ten marbles  four blue ones, three red ones, and the remainder are yellow. He shuts his eyes and picks out a marble.
a) 
The probability that it is blue is:

(A) \(1 \over 9\) (B) \(1 \over 4\) (C) \(4 \over 10\) (D) \(4 \over 6\)
(E) None of these. The answer is __________.


b) 
The probability that it is yellow is:

(A) \(1 \over 9\) (B) \(3 \over 10\) (C) \(1 \over 3\) (D) \(3 \over 7\)
(E) None of these. The answer is __________.


c) 
The marble Ash picked out was blue. He put this blue marble on the table and then picked out another marble.
The probability that this marble is red is:

(A) \(1 \over 9\) (B) \(3 \over 10\) (C) \(3 \over 9\) (D) \(3 \over 8\)
(E) None of these. The answer is __________.
