If I ask one a challenge and doesn't reply to the challenge who wins and who losses

Question

About challenges

Answer 1

why???

Answer 2

I think
If the person accept your challenge that's no matter, if doesn't reply the challenge will be expired!

Answer 3

Please don't answer your own question. If you know the answer, don't ask it in the first place.
https://www.sololearn.com/discuss/1316935/?ref=app