In how many ways 4 letters can be posted in two post boxes?
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Answer Posted / koustav chakraborty
as for question have to post atleast 1 letter in 2 box.. i think the posibilty to post 4 letter in 2 box is 3 ..cause
1st box 1 letter and 2nd box 3 letter,
1st box 2 letter and 2nd box 2 letter,
1st box 3 letter and 2nd box 1 letter.
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