In an arithmetic progression

MATHEMATICS · Multi-part · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

In an arithmetic progression, the fourth term is 15 and the tenth term is 39. (a) Find the first term and the common difference. (b) Determine the 25th term of the progression. (c) Find the sum of the first 20 terms.

Related theory

Arithmetic Progressions
Sequences and series
Algebra
Sum of first n terms of an AP

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