I recently found that the following post $\lim_{x\rightarrow +\infty}\sqrt{x}e^{-x}\left(\sum_{k=1}^{\infty}\frac{x^{k}}{k!\sqrt{k}}\right)$ was deleted by vote(s) and as a result my answer also got deleted.
Does such deletion affect my reputation score?
Also I had later on asked a related question linking the above post. This deletion actually results in loss of context for my post.
It is the correct response if low quality questions are closed (and that should be enough) but should such posts be allowed to be deleted especially when there is an answer to the question that might help others in future?
Users don't get notified if a certain post gets deleted and neither does it show where the rep was lost
-- this is true. However, that positive rep does disappear from your rep history; and so you can see which rep has disappeared, and then you know that a question has been deleted. $\endgroup$