Yes you are right... I'm using both forums for my learning and solving doubts... my general tendency is spend couple of hours on single problem or syntax and then go on web instead of spending too much time reinventing wheel.
On other site my inital question was different then I changed my practice test question to make logic right.
It's considered polite to inform about crossposting so people not attending both sites don't waste their time hacking a problem already solved at the other end of the internet.
Agree.. but honestly didn't knew I was suppose to mentioned other website name over here... some considers it as marketing. Will definitely keep this in mind for future.