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2. A coin is flipped seven times and the sequence of heads/tails is observed. (a) How many sequences are possible? (b) How many sequences start

2. A coin is flipped seven times and the sequence of heads/tails is observed. (a) How many sequences are possible? (b) How many sequences start with HT? (c) How many sequences have exactly five heads? (d) How many sequences have at least two heads?

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