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1. A coin is tossed six times. What is the probability that it lands tails exactly once? 2. Two dice are rolled. What is the

1. A coin is tossed six times. What is the probability that it lands tails exactly once?

2. Two dice are rolled. What is the probability that the numbers obtained add up to 10? 3. A passcode consists of a sequence of five English letters (so there are 26 possible choices for each letter). If I make a random guess for each letter, what is the probability of guessing at least one letter correctly?

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