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Q.
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
E.
None of the above
View Answer
Correct choice: B
Explanation:
Three letters can be posted in 4 letter boxes in 4
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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