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Probability question: 80% of all e-mail is spam, and the phrase free money is used in 10% of spam e-mails. The phrase is also used

Probability question: 80% of all e-mail is spam, and the phrase "free money" is used in 10% of spam e-mails. The phrase is also used in 1% of non-spam e-mails. A new e-mail has just arrived which contains the phrase "free money". Given this information, what is the probability that it is spam? Round your answer to 4 decimal places.

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