A construction company has a bid on two contracts. The probability of winning contract A is 0.3. If the company wins contract A, then the probability of winning contract B is 0.4. If the company loses contract A, then the probability of winning contract B decreases to 0.2. Draw a probability tree to find the probability of the following events. a) Winning both contracts b) Winn exactly one contract c) Winning at least one contract

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