Respuesta :
In total there are 4 cubes, and only one of them is blue, so there are 3 red cubes.
Solution:
To make a Cube Train , Larry used a Pattern of Colors, which are
Red Cube + Blue Cube + Red Cube + Again a Red Cube+Same Pattern
If we Represent in terms of Symbols,we can denote it as
R B R R.....R BRR.....R B R R.....
So, to make a Single Cube Train , number of Red cube Used = 3