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A letter in math can stand for any number
p= n=4
It is an expression
n will typically mean number. It can stand for any given number, and what it stands for will depend on the problem.
"Respective" means "in that order". So, for example, weights of 1 Newton, 2 N and 3 N at points p q and r respectively, menas a weight of 1 N at point p, 2 N at q and 3 N at r.