I started with 1 yellow tile in the center,
which was surrounded by 6 blue tiles.
which was surrounded by 12 red tiles.
If I wanted to use green tiles to surround the red tiles, how many tiles would I need?
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1 Yellow............................................................................0+6=6 +6=12+6 =18
6 Blues.................BECAUSE OF THE SEQUENCE , 1 ,..6,........12.,.......18.
12 Reds................................................................................... Y-B.........-R..........-G.
18 Greens