Check catalan numbers. They are exactly what you are looking for. http://en.wikipedia.org/wiki/Catalan_numberThe answer is C(49)=98!/(50!49!)

Hi KMG, did you finish the web based test. Could you give me some info about the difficulty level/topics of the test. I have one next week also with IKM. My experience is also very similar to yours in that I havent used C++ in a while.Thanks for your info.SP