Need help with probability tree question! (At least one win)

Hello, I need help with a question on a probability tree question. I've been trying for ages to work it out, but I may just be being stupid. I need help, not just the answer. Can someone explain it to me?

Kirk123 said:

Hello, I need help with a question on a probability tree question. I've been trying for ages to work it out, but I may just be being stupid. I need help, not just the answer. Can someone explain it to me?

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