Question at position 4 What will the following code output? a = not (False or False) and (True or False) b = True and (not False and (True or False)) c = (True or (False and True)) and (not False or True) print(a, b, c)False True TrueTrue False FalseFalse True FalseTrue True TrueClear my selection单项选择题
A
False True True
B
True False False
C
False True False
D
True True True

Question

Question at position 4 What will the following code output? a = not (False or False) and (True or False) b = True and (not False and (True or False)) c = (True or (False and True)) and (not False or True) print(a, b, c)False True TrueTrue False FalseFalse True FalseTrue True TrueClear my selection单项选择题

A

False True True

B

True False False

C

False True False

D

True True True

BlackTom AI · Accepted Answer

Boolean operator precedence is: not > and > or. Parentheses alter evaluation order, and each subexpression should be reduced to a Boolean value before combining.

1) Relevant concepts
- Parentheses force the order of evaluation.
- not negates a single Boolean.
- and returns True only if both operands are True.
- or returns True if at least one operand is True.
- Precedence: evaluate parentheses first, then not, then and, then or.

2) Step-by-step evaluation

Expression a:
a = not (False or False) and (True or False)
- Inside left parentheses: False or False -> False
- Apply not: not False -> True
- Inside right parentheses: True or False -> True
- Combine with and: True and True -> True
So a evaluates to True.

Expression b:
b = True and (not False and (True or False))
- Innermost: True or False -> True
- not False -> True
- Then inside parentheses: True and True -> True
- Combine with leading True: True and True -> True
So b evaluates to True.

Expression c:
c = (True or (False and True)) and (not False or True)
- Inside left parentheses: False and True -> False; then True or False -> True
- Right parentheses: not False -> True; then True or True -> True
- Combine with and: True and True -> True
So c evaluates to True.

3) Why the correct answer is correct
Each subexpression reduces to True, and combining them with and produces True for all three variables. The print(a, b, c) call therefore outputs: True True True.

4) Why other options are incorrect
- "False True True": a was shown True, not False.
- "True False False": b and c are True, not False.
- "False True False": both a and c are shown True, not False.

Conclusion: The final printed output is True True True, matching the provided correct answer.

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