What are the rules for writing challenge questions?

Question

Most questions of challenges are incorrect!
I wish I could upload some pictures to illustrate that. 😠😠

Answer 1

Refer to these threads for more information :

https://www.sololearn.com/discuss/470195/?ref=app
https://www.sololearn.com/discuss/336100/?ref=app
https://www.sololearn.com/discuss/925058/?ref=app
https://www.sololearn.com/discuss/370793/?ref=app

Thanks

Answer 2

One rule is that there should not be too many similar existing questions.