The fifth term of a geometric progression is 16 and the eighth term is 128

MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series

Problem

The fifth term of a geometric progression is 16 and the eighth term is 128, all terms being positive. (a) Determine the common ratio. (b) Find the first term. (c) Using the values obtained, calculate the twelfth term.

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