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Q.

A letter is known to have come either from 'JALALABAD' or 'ADILABAD'. On the  envelope. Just two consecutive letters 'LA' are visible. The probability that the letter comes from 'ADILABAD' is

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a

411

b

711

c

511

d

611

answer is A.

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Detailed Solution

Using baye's theorem p(E1)=p(E2)=12p(AE1)=28=14,p(AE2)=17p(E2A)=1714+17=411
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