The fourth term of a geometric progression is 81 and the sum of the first four terms…

MATHEMATICS · Subjective · CBSE · Mathematics · Sequences and Series · Sequences and Series

Problem

The fourth term of a geometric progression is 81 and the sum of the first four terms is 120. (a) Show that the common ratio is 3. (b) Find the first term. (c) Calculate the sum of the first seven terms.

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