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In how many ways 3 letters can be posted in 4 letter-boxes, if all the letters are not posted in the same letter-box
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Verified Answer
The correct answer is:
$60$
Three letters can be posted in 4 letter boxes
in $4^{\wedge} 3=64$ ways but it consists the 4 ways
that all letters may be posted in same box.
Hence required ways $=60$.
in $4^{\wedge} 3=64$ ways but it consists the 4 ways
that all letters may be posted in same box.
Hence required ways $=60$.
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