The story of the letters and the boxes...
Probability
Level
2
There are 3 letters and 4 letter boxes in an area. The number of ways of posting 3 letters if all the three letters are NOT posted in the same letter box is?
The answer is 60.
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1 solution
No. of ways of posting 3 letter= 4 x 4 x 4 =64
No. of ways of posting 3 letters in same box=4 ways
No. of ways of posting 3 letters in different box= 64 - 4=60 ways