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Winning trades streak

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A trader makes independent trades, and each trade wins with probability . What is the probability that at least trades win?

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A whole number, a decimal, a fraction like 3/8 or a percent.

Hint

Count the ways to have exactly wins and exactly wins.

Solution
  1. The total number of equally likely win and loss sequences is .
  2. Exactly wins can occur in ways, and exactly wins in way.
  3. The favorable count is .
  4. The probability is .

Answer: