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.
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