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The question is not homework. I have been out of school over 35 years and I am re-learning math/algebra on my own. I was just needing some assistance. Thank you.

There are n+1 equal spaces between the posts, so the distance between any two posts will be

d/(n+1)

Draw a few pictures to see why

Let "p" represent a post

If n=3

p p p p p

4 spaces

If n=7

p p p p p p p p p

8 spaces

there's a space in front of each post except the last one , so n+1 spaces

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