Report an error
Found a mistake in a question, an answer or a solution? Tell us. We check every report, fix the paper if needed and send corrected files free to everyone who bought it.
What happens next
- We read your report and recompute the answer independently.
- If you are right, we correct the paper and the solutions.
- Everyone who bought the paper gets the corrected files by email, free.
If you would rather email directly: abbas.miscellaneous@gmail.com