Hidden Faces of a Line of Cubes

My tested formula is correct. I got this formula by looking at the multi-link cubes and doing the same thing I did to get my first formula. I looked at how many faces were hidden in the end two and then looked at the number of hidden faces in the centre cubes, I then devised the above formula.
Conclusion: I thought my investigation went very well. I found my formulas quite quickly and I was able to write them up. I will now try to apply some of the same techniques used in this investigation to my extension work, Hidden Faces of a Cuboid.
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