AP CSP 3.5 Boolean Expressions Pt. 2

Directions: For the question or incomplete statement below, two of the suggested answers are correct. For this question, you must select both correct choices to earn credit. No partial credit will be earned if only one correct choice is selected. Select the two that are best in each case.

Which of the following Boolean expressions are equivalent to the expression

num ≥ 15

Select two answers.

• (num > 15) AND (num = 15)

• (num > 15) OR (num = 15)

• NOT (num < 15)

• NOT (num < 16)

In a certain country, a person must be at least 16 years old to drive a car and must be at least 18 years old to vote. The variable age represents the age of a person as an integer.

Which of the following expressions evaluates to true if the person is old enough to drive but not old enough to vote, and evaluates to false otherwise?

I. (age ≥ 16) AND (age ≤ 18)

II. (age ≥ 16) AND (NOT(age ≥ 18))

III. (age < 18) AND (NOT(age < 16))

• II only

• I and II only

• I and III only

• II and III only

• (onFloor1 AND callTo2) AND (onFloor2 AND callTo1)

• (onFloor1 AND callTo2) OR (onFloor2 AND callTo1)

• (onFloor1 OR callTo2) AND (onFloor2 OR callTo1)

• (onFloor1 OR callTo2) OR (onFloor2 OR callTo1)

• The output will be true no matter what the value of input B is.

• The output will be false no matter what the value of input B is.

• The output will be true if input B is true; otherwise it will be false.

• The output will be false if input B is true; otherwise it will be true.

• Input A must be true.

• Input A must be false.

• Input A can be either true or false.

• There is no possible value of input A that will cause the circuit to have the output true.