6 letters are to posted in 3 letter box . the no. of ways of posting letter when no letter box remains empty-----
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Refer the following similar link:
https://www.meritnation.com/ask-answer/question/please-answer-to-the-actual-question-don-t-provide-unmatche/permutations-and-combinations/8815347
Hope this would have clear your doubt. Do let us know in case of any further concerns.