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Homework Statement:

Q: State how many ways distinguishable toys can be put into three distinguishable boxes.
A: 81
Relevant Equations:
 
I thought the number of ways would be dependant upon the number of toys.
Since the number of toys isn't given I tried taking into the different ways you can order using different number of boxes.
First situation:
They can use all three boxes 3x2x1=6.
Second situation:
They can only use two boxes so 3choose2 x2= 6
Third situation:
They can only use one box so there are three ways as in you put all the toys in one box.
The sum of these different ways are 15 which isn't correct.
[Moderator's note: Moved from a technical forum and thus no template.]
Since the number of toys isn't given I tried taking into the different ways you can order using different number of boxes.
First situation:
They can use all three boxes 3x2x1=6.
Second situation:
They can only use two boxes so 3choose2 x2= 6
Third situation:
They can only use one box so there are three ways as in you put all the toys in one box.
The sum of these different ways are 15 which isn't correct.
[Moderator's note: Moved from a technical forum and thus no template.]