videogame probability – Mathematica Stack Exchange

I am trying to get some help with this problem:

A war videogame has three individuals. A, B, C. A has a probability of hitting its target with his shot of 1/3, and individuals B and C have a probability of hitting their targets with their shots of 1/4 and 1/5 respectively. In each battle of this war, individuals shoot until no one or one of the participants is left alive, by selecting randomly between the other individuals as their targets.

  • How long will you expect the war to last?
  • If in the first battle B is killed, what is the probability A will survive?

So far I have stablished a Markov Chain to try and solve this, but truth is I have gotten stuck.

Thank you!

Cannot use psql anymore – Database Administrators Stack Exchange

I intend to use psql on Ubuntu.
To authenticate, I used many things in the past:

  • Simply write password when asking
  • .pgpass file
  • PGPASSWORD variable

This was several weeks ago.
I think my attempts were not clean and I kinda messed up my configuration:
I deleted the .pgpass file and the PGPASSWORD variable but I get this error:

psql: error: server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.

It don’t even ask for a password.

The fun fact is that when an admin connect on my computer and try whith :

sudo -u myuser psql ...

It works!

What can I do to clean up everything?

Explicit vs transparent proxy – Information Security Stack Exchange

As far as I have understood it:

  • An explicit proxy challenges the user/application within his session.
  • NGFW (transparent proxy) and SSO/identity-based solutions are just letting everything pass that is using the current IP address of the user.

I agree the latter is flexible with regard to roaming users (VPN, Wifi and whatnot) but IMHO similar to machine/IP-based authentication, i.e. a step back from actually challenging the individual application for access. (Note: if you use a captive portal, non-interactive apps will have a hard time authenticating.)

The transparent proxy would let all traffic from your machine go directly to the URL filter, including the potential malware. Whereas in the explicit scenario the malware would need to obtain the user’s credentials, parse the PAC file or somehow else determine the location of the proxy to use etc. Might be considered security through obscurity, still more hurdles can’t hurt…
Additionally, a transparent proxy would require recursive DNS access to the Internet, meaning DNS security would need to be implemented. Whereas when using an explicit proxy, the client needs no DNS access at all, the proxy itself would perform a DNS request once the URL filtering/categorization or any other mechanism has allowed access.

Somehow I fail to see where transparent approach would provide more security than explicit.
The more modern approach (NGFW/transparent) seem to rely more and more on blacklisting and heuristics, while we learned that actual security only comes from denying everything that we do not know i.e. whitelisting. I agree that this is difficult in today’s Internet though.
So which one is more secure, transparent or explicit, or does it only depend on the individual definition of security/risk?

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Facebook profile url – Web Applications Stack Exchange

My facebook profile link is in the form where John Smith is my display name. The email however which I use to log in is

My mom’s facebook profile page is while her display name is Mary Poppins, while the email she uses to log in is

Furthermore, I have friend, when I went to his profile page, address was

How come facebook uses different ways to form profile url? Firstly, user public name, secondly, user email (which is not secure at all), and thirdly, user id? Where this can be changed?

Webmoney Exchange to INR

I want to sell WEBMONEY for INR ( Google Pay) (UPI) (IMPS)

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Escalation timeout power automate – SharePoint Stack Exchange

I would like to repeat that scenario

But in my flow (below) on second condition flow end.

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enter image description here

Unable to process template language expressions for action ‘Condition’ in line ‘1’ and column ‘57970’: ‘Template language function endsWith’ expects the type of the first parameter to be a string. The type of value provided is “Null”. For details on use, please visit ”.

About mining difficulty – Bitcoin Stack Exchange

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