The ranks are: 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King, Ace. The suits are: Clubs, Diamonds, Hearts, Spades. For this question, we represent each rank by a string of length one:
’2’ to ’9’ for 2 to 9 respectively, ’T’ for 10,
’J’ for Jack, ’Q’ for Queen, ’K’ for King, ’A’ for Ace.
We also represent each suit by a string of length one:
’C’ for Clubs, ’D’ for Diamonds, ’H’ for Hearts, ’S’ for Spades.
Fall 2014
Finally, we represent a card by a string of length 2, the first character being the rank and the second being the suit. For example, Queen of Hearts is represented by ’QH’, and 3 of Clubs is represented by ’3C’.
In the game of bridge, a hand consists of 13 cards, which we represent by a list of cards. When given a hand, here is the common way to count points.
High rank points:
• For each Ace, we count 4 points.
• For each King, we count 3 points. • For each Queen, we count 2 points. • For each Jack, we count 1 point.
Short suit points:
• For each suit, we count 1 point if the hand contains exactly two cards of that suit. • For each suit, we count 2 points if the hand contains exactly one card of that suit. • For each suit, we count 3 points if the hand contains no cards of that suit.
On the next page, write a function which takes a hand as input and returns the number of points in that hand.

The mode is generally used when delivering a presentation to an need now

Is a string of code written to hurt others by damaging or destroying

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?