if you have 1 post 0 rails, 2 posts, 3 rails and 3 posts, 6rails, what is the nth term

Question

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Answer 1

if you have 1 post 0 rails, 2 posts, 3 rails and 3 posts, 6rails, what is the nth term

The number of posts increases uniformly, one at a time.

The number of rails increases uniformly, three at a time.

The nth pair (Post, Rail) is given by,

Tn(P,R) = (n, 3n - 3)