Quantitative Aptitude Ques 2449

Question: In how many ways 3 letters can be posted in 4 letters boxes, if all the letters are not posted in the same letter box?

Options:

A) 63

B) 60

C) 77

D) 81

Show Answer

Answer:

Correct Answer: B

Solution:

  • The number of ways in which three letters can be posted in 4 letter boxes $ =4^{3}=64 $ but it include the 4 ways in which all letters may be posted in same box. Hence, required number of ways $ =64-4=60 $
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