A poker hand is defined as drawing 5 cards at random without replacement from a deck of 52 playing cards. Find the probability of each of the following poker hands:
(a) Four of a kind (4 cards of equal face value and one card of a different value),
(b) Full house (one pair and one triple of cards with equal face value),
(c) A straight flush (all cards in the same suit with consecutive face values, except the royal flush which contains 10, jack, queen, king, and ace of the same suit).