•A letter is drawn from box 1 and placed in box 2. Then, a letter is drawn from box 2 and placed in box 3. Finally, a letter is drawn from box 3. What is the probability that the letter drawn from box 3 is B? (Call this event E.)
Here i assumed the boxes considering the letter A & B because you didn't provide the boxes.
Hope you got your answer, if you have any doubts please comment. Thank you.
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