This is a challange problem.
you play a game against a smart partner. the game goes like this. each person, in his turn, chooses a number from 1-9 that hasn't been chosen before. game ends when all numbers have been chosen, or when someone wins. someone wins if he has chosen any three numbers which sum up to 15, so for example, if i have 2,4,8,9, i win, because 2+4+9=15.
find a strategy for this game; can the first player win? can the second? which one has a strategy?
pmed Jameson the Admin the solution(the only mod i could find, sorry >_<)
Moderator edit: Approved.