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

In how many ways 3 letters can be posted in 4 letter-boxes, if all the

1.	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
A.	63
B.	60
C.	77
D.	81
Answer» C. 77

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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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