If you wrote the incorrect answer sheet serial number on the attendance sheet, it could lead to some confusion during the evaluation process. However, most universities allow corrections for such mistakes. It’s best to notify the exam authorities to prevent any complications.

Generally, if you have written the wrong answer sheet serial number on the attendance sheet, it might cause confusion during the evaluation process, but it doesn't necessarily mean you will fail. Here’s what could happen:

1. No Major Issue : If the examiners can still match your attendance sheet with the correct answer sheet through other identifiers (such as your roll number), the mistake might be overlooked, and your paper will be evaluated as usual.
   
   

2. Potential Verification Process : Some universities might verify the answer sheets based on the roll number and other details before marking. If the wrong serial number is written, they could cross-check it with other records, but this shouldn't result in automatic failure.
   
   

3. Contact University Authorities : If you are concerned, it's a good idea to immediately inform the exam authorities or the examination department. They may be able to rectify or clarify the issue before the evaluation process starts.

In conclusion, it's unlikely to result in a fail, but it’s always better to clarify the situation with the university to avoid complications.

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Thank you and wishing you all the best for your bright future.