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How many times must a man toss a fair...

How many times must a man toss a fair com so that the probability of having at least one head is more than 90%?

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How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

How many times must a man toss a fair coin so that the probability of having atleast one head is more than 90%?

How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?

How many times must a man toss a fair coin so that the probability of having at least one head is more then 80%?