AP CSP Math (3.3)

• Step 1: Add num1 and num2 and store the result in the variable sum.

  Step 2: Take the absolute value of sum and display the result.

• Step 1: Subtract num1 from num2 and store the result in the variable diff.

  Step 2: Take the absolute value of diff and display the result.

• Step 1: Take the absolute value of num1 and store it in the variable absNum1.

  Step 2: Take the absolute value of num2 and store it in the variable absNum2.

  Step 3: Add absNum1 and absNum2 and display the result.

• Step 1: Take the absolute value of num1 and store it in the variable absNum1.

  Step 2: Take the absolute value of num2 and store it in the variable absNum2.

  Step 3: Subtract absNum1 from absNum2 and display the result.

A teacher has a goal of displaying the names of 2 students selected at random from a group of 30 students in a classroom. Any possible pair of students should be equally likely to be selected. Which of the following algorithms can be used to accomplish the teacher’s goal?

• Step 1: Assign each student a unique integer from 1 to 30.

  Step 2: Generate a random integer n from 1 to 15.

  Step 3: Select the student who is currently assigned integer n and display the student’s name.

  Step 4: Generate a new random integer n from 16 to 30.

  Step 5: Select the student who is currently assigned integer n and display the student’s name.

• Step 1: Assign each student a unique integer from 1 to 30.

  Step 2: Generate a random integer n from 1 to 30.

  Step 3: Select the student who is currently assigned integer n and display the student’s name.

  Step 4: Generate a new random integer n from 1 to 30.

  Step 5: Select the student who is currently assigned integer n and display the student’s name.

• Step 1: Assign each student a unique integer from 1 to 30.

  Step 2: Generate a random odd integer n from 1 to 29.

  Step 3: Select the student who is currently assigned integer n and display the student’s name.

  Step 4: Generate a new random even integer n from 2 to 30.

  Step 5: Select the student who is currently assigned integer n and display the student’s name.

• Step 1: Assign each student a unique integer from 1 to 30.

  Step 2: Generate a random integer n from 1 to 30.

  Step 3: Select the student who is currently assigned integer n and display the student’s name.

  Step 4: The student who was selected in the previous step is assigned 0. All other students are reassigned a unique integer from 1 to 29.

  Step 5: Generate a new random integer n from 1 to 29.

  Step 6: Select the student who is currently assigned integer n and display the student’s name.

Which of the following code segments can be used to interchange the values of the variables num1 and num2?

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• 
• 
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• temp ← word1

  word3 ← word1

  word1 ← temp

• temp ← word1

  word1 ← word3

  word3 ← temp

• temp ← word1

  word1 ← word2

  word2 ← word3

  word3 ← temp

• temp ← word3

  word3 ← word2

  word2 ← word1

  word1 ← temp

• 1

• 2

• 3

• 4

• 10 20 30 40

• 21 30 40 50

• 21 40 30 40

• 21 40 30 50