Q$44.$ Write a recursive definition for an arithmetic progression with initial term a and common difference $d.$

Hint: use the definition from Q$28$ section $2\mathrm{.}2($pasted below$)$ to write the recursive definition.

$28.$ An arithmetic progression $($arithmetip sequence$)$ is a sequence of terms where there is an initial term a and each succeeding term is obtained by adding a common difference $d$ to the previous term. Prove the formula for the sum of the first