Ramon is playing a game in which he must pull two blocks out of a bag containing red and yellow blocks. He cannot look, and he cannot replace the block. The bag has 4 more red blocks than yellow blocks.
a) Write and simplify an expression that represents Ramon's probability of picking a red block, then a yellow block.
b) What is the probability that Ramon pulls a red block then a yellow block if there are 6 yellow blocks in the bag before his pick?
c) What is the probability that Ramon pulls two yellow blocks if there are 6 yellow blocks in the bag before his first pick?

Question

Ramon is playing a game in which he must pull two blocks out of a bag containing red and yellow blocks. He cannot look, and he cannot replace the block. The bag has 4 more red blocks than yellow blocks. 
a) Write and simplify an expression that represents Ramon's probability of picking a red block, then a yellow block.
b) What is the probability that Ramon pulls a red block then a yellow block if there are 6 yellow blocks in the bag before his pick?
c) What is the probability that Ramon pulls two yellow blocks if there are 6 yellow blocks in the bag before his first pick?