A blackjack consists of two cards, one of which is an Ace and the other of which is a 10-point card, either a 10, Jack, Queen, or King.
a) How many different blackjacks are there in a 52-card deck?
b) In the game blackjack, one card is dealt down and the other is dealt up. Thus, in a sense order of the two cards matters. In this case, how many different blackjacks are there?
c) In a pinochle deck there are eight cards of each rank 9, 10, Jack, Queen, King, Ace (two indistinguishable cards of each suit) and no other cards. How many blackjacks are there, assuming order is unimportant?