Problem 161 of 7
Correct the addition-rule error: A student computes P(not A or not B) as 1 - P(A or B).
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
catch double-counting, missing intersection, and exclusive/inclusive confusion.
Hidden until you reveal it.
Correction must fix double-counting, overlap, complement, or inclusive-or confusion.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify whether the events overlap or are exclusive.
2. Write the correct union or complement rule.
3. Explain the correction in context.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Only changing arithmetic without identifying the conceptual error.