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Quantitative Aptitude :: Probability - Discussion

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Choose the correct option.

After the typist writes 12 letters and addresses 12 envelopes, she inserts the letters randomly into the envelopes (1 letter per envelope). What is the probability that exactly 1 letter is inserted in an improper envelope?

A1/12

B0

C12/212

D11/12

Answer: Option (Login/Signup)

Show Explanation

Answer: zero



Solution:



If one letter is put in a wrong envelope, then one other letter must also be put in the wrong envelope. So zero is the probability that exactly 1 letter is inserted in an improper envelope because it's not possible.

Asked In :: TCS TCS NQT

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