A LETTER HAS COME FROM EITHER CALCUTTA OR TATANAGAR.ONLY THE LETTER 'TA' IS VISIBLE.FIND THE PROBABILITY THAT THE LETTER HAS COME FROM TATANAGAR?

if the letters TA are jointly spaced, that is to say they are in order and they are spaced near to each other then the probablity is 2/3.

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Rahul- IIT Roorkee

Solving it by Bayes theorem let P(word 1)=1/2 ,P(word 2)=1/2P(ta/word1)=2/8 & P(TA/word2)=1/7 so ...Using P(word1/ta)=2/8*1/2 / 2/8*1/2+1/7*1/2=ans solve it