Can someone please help me answer the following probability question:
A bag contains 3 red tokens, 3 golden tokens and k black tokens. If you pick a golden token you win the game, if you pick a red token you get another go (but after that no more goes) and if you get a black token you lose. Using a tree diagram calculate (in terms of k) the probability of winning. Given that there is an equal chance of winning and losing, calculate the value of k.
Is it really that intense? Would I cope?