The first term of an arithmetic sequence is 7 and its 25th term is 103

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

The first term of an arithmetic sequence is 7 and its 25th term is 103. (i) Find the common difference of the sequence. (ii) Determine the sum of the first 25 terms. (iii) If SnS_n denotes the sum of the first nn terms, obtain SnS_n in terms of nn.

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