Question: An arithmetic progression has first term a and common difference d. The sum of the first 100 terms is 25 times the sum of the

An arithmetic progression has first term a and common difference d. The sum of the first 100 terms is 25 times the sum of the first 20 terms.

a. Find d in terms of a.

b. Write down an expression, in terms of a, for the 50th term.

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