I have been working on these problems for a several hours and am stuck. Can anyone help me at all? Here are the problems:

A poker hand is defined as drawing five cards at random without replacement from a deck of 52 playing cards. Find the probability of each of the following poker hands:

A. Two pairs (two pairs of equal face value plus one card of a different value)

B. One pair (one pair of equal face value plus three cards of different values)