How many different towers can I make with blue on the bottom?
![](https://apsmo.edu.au/wp-content/uploads/2023/07/Tower-blocks-1.png)
How many different towers can I make where blue and green don’t touch?
![](https://apsmo.edu.au/wp-content/uploads/2023/07/Tower-blocks-2.png)
How many different towers can I make with blue on the bottom?
How many different towers can I make where blue and green don’t touch?
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