If the letter is never delivered what is the probability


You ask your roommate to mail a letter for you. Suppose there is a 0.21 probability your roommate will forget to mail it. 

Should your roommate mail your letter, there is a 0.9 probability that Canada Post will deliver the letter. 

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

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Business Economics: If the letter is never delivered what is the probability
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