Math 20, Spring 2007

Discrete Probability

General Information Syllabus Homework Assignments Exam Related



Homework assignments

Practice problems are not to be submitted, but are very important. You are encouraged to do even more of these than are assigned. Here is a link to the solutions to odd numbered exercises

Written assignments will be submitted in via assignment boxes.


Week of May 21 -- May 25, 2007

Friday, May 25:
  • Read
    11.3.
  • Practice problems  (for next class period)
    11.3: 3, 6.
  • Written assignment  (for Wednesday, May 30)
    11.3: 10, 13, 17.
Wednesday, May 23:
  • Read
    11.3.
  • Practice problems  (for next class period)
    11.3: 1, 5.
  • Written assignment  (for Friday, May 25)
    11.3: 2, 8, 15.
Monday, May 21:
  • Read
    11.2.
  • Practice problems  (for next class period)
    11.2: 2, 8.
  • Written assignment  (for Wednesday, May 23)
    11.2: 9, 19.

Week of May 14 -- May 18, 2007

Friday, May 18:
  • Read
    11.2.
  • Practice problems  (for next class period)
    11.2: 1, 3, 4.
  • Written assignment  (for Monday, May 21)
    11.2: 6, 15, 18.
Wednesday, May 16:
  • Read
    11.1.
  • Practice problems  (for next class period)
    11.1: 2, 4, 7, 8.
  • Written assignment  (for Friday, May 18)
    11.1: 11, 12, 19.
Monday, May 14:
  • Read
    9.2.
  • Practice problems  (for next class period)
    9.2: 1, 7.
  • Written assignment  (for Wednesday, May 16)
    9.2: 5, 11.

Week of May 7 -- May 11, 2007

Friday, May 11:
  • Read
    9.1, 9.2.
  • Practice problems  (for next class period)
    9.1: 5, 7, 8.
  • Written assignment  (for Monday, May 14)
    9.1: 12, 13, 17.
Wednesday, May 9:
  • Read
    9.1, 9.2.
  • Practice problems  (for next class period)
    9.1: 1, 3, 4.
  • Written assignment  (for Friday, May 11)
    9.1: 6, 9, 10.
Monday, May 7:
  • Read
    9.1.
  • Practice problems  (for next class period)
    5.2: 14, 25.
  • Written assignment  (for Wednesday, May 9)
    5.2: 26, 27, 28.

Week of April 30 -- May 4, 2007

Friday, May 4:
  • Read
    8.1.
  • Practice problems  (for next class period)
    8.1: 1, 5, 6.
  • Written assignment  (for Monday, May 7)
    8.1: 9, 10, 12
Wednesday, May 2:
  • Read
    5.1, 8.1
  • Practice problems  (for next class period)
    5.1: 14, 21, 26.
  • Written assignment  (for Friday, May 4)
    5.1: 27, 28, 32.
Monday, April 30:
  • Read
    5.1.
  • Practice problems  (for next class period)
    5.1: 35, 38.
  • Written assignment  (for Wednesday, May 2 )
    5.1: 40, 42, 43

Week of April 23 -- April 27, 2007

Friday, April 27:
  • Read
    5.1.
  • Practice problems  (for next class period)
    5.1: 6, 7.
  • Written assignment  (for Monday, April 30)
    5.1. 8, 9, 10.
Wednesday, April 25:
  • Read
    5.1.
  • Practice problems  (for next class period)
    5.1: 1, 2.
Monday, April 23:
  • Read
    6.2.
  • Practice problems  (next session)
    6.2: 2, 8, 10.
  • Written assignment  (for Wednesday, April 25)
    6.2: 15, homework set Friday extended to Wednesday.

Week of April 16 -- April 20, 2007

Friday, April 20:
  • Read
    6.2.
  • Practice problems  (for next class period)
    6.2: 3.
  • Written assignment  (for Monday, April 23)
    6.2: 5, 9, 11, 12.
Wednesday, April 18:
  • Read
    6.1, 6.2.
  • Practice problems  (for next class period)
    6.2: 4.
    Additional problems: (a) Two hats each contain four pieces of paper numbered 1, 2, 3, 4. One number is randomly drawn from each hat. What is the expected sum of the numbers? (Ans: 5.)
    (b) Given that neither of the drawn numbers is 3, what is the expected sum of the numbers? (Ans: 14/3.)
  • Written assignment  (for Friday, April 20)
    6.1: 36.
Monday, April 16:
  • Read
    6.1.
  • Practice problems  (for next class period)
    6.1: 5, 6, 8.
  • Written assignment  (for Friday, April 20)
    4.1: 12, 18, 39.
    6.1: 13, 14, 17.

Week of April 9 -- April 13, 2007

Friday, April 13:
  • Read
    4.1, 6.1.
  • Practice problems  (for next class period)
    4.1: 13, 26, 29.
  • Written assignment  (for Monday, April 16)
    4.1: 27, 34, 36, 46.
Wednesday, April 11:
  • Read
    4.1.
  • Practice problems  (for next class period)
    4.1: 5, 9.
  • Written assignment  (for Friday, April 13)
    Additional problem: Alice, Bob, and n-2 other people are boarding an airplane with n seats. Alice, who has lost her boarding pass, is first in line and Bob is last. Alice chooses a seat at random. Each passenger behind her, including Bob, sits in his or her assigned seat if it is not occupied and chooses a seat at random if it is. For n = 2, 3, 4 find the probability that Bob sits in his own seat.
  • Written assignment  (for Friday, April 13)
    4.1: 8, 17, 22.
Monday, April 9:
  • Read
    3.2
  • Practice problems  (for next class period)
    3.2: 23.
  • Written assignment  (for Wednesday, April 11)
    3.2: 22, 24, 34a.

Week of April 2 -- April 6, 2007

Friday, April 6:
  • Read
    3.2.
  • Practice problems  (for next class period)
    3.2: 9, 11, 15.
  • Written assignment  (for Monday, April 9)
    3.2: 8, 20, 31.
Wednesday, March 4:
  • Read
    3.2.
  • Practice problems  (for next class period)
    3.2: 1, 3.
  • Written assignment  (for Friday, April 6)
    3.1: 14, 23.
    3.2: 12.
Monday, April 2:
  • Read
    3.1.
  • Practice problems  (for next class period)
    3.1: 3, 5, 11.
  • Written assignment  (for Wednesday, April 4)
    3.1: 10, 12, 13, 17.

Week of March 28 -- March 30, 2007

Friday, March 30:
  • Read
    1.2, 3.1.
  • Practice problems  (for next class period)
    1.2: 10, 11, 13.
  • Written assignment  (for Monday, April 2)
    1.2: 22, 23, 31.
Wednesday, March 28:
  • Read
    1.2.
  • Practice problems  (for next class period)
    1.2: 2, 6, 9.
  • Written assignment  (for Friday, March 30)
    1.2: 16, 18, 25.