Question

larry used a pattern of colors to make a cube train. He used a red cube, a blue cube, a red cube, and another red cube before he started the pattern again. How many red cube did Larry use?

Answer 1

In total there are 4 cubes, and only one of them is blue, so there are 3 red cubes. 

Answer 2

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