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You ask your roommate to mail a letter for you. Suppose there is a 0.24 probability...

You ask your roommate to mail a letter for you. Suppose there is a 0.24 probability your roommate will forget to mail it.

Should your roommate mail your letter, there is a 0.93 probability that Canada Post will deliver the letter.

If the letter is never delivered, what is the probability that your roommate mailed the letter?

Math   Statistics-And-Probability   
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