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If the first (4) terms of a geometric progression are (3,15,75,375), what is (S_4)?

Answer and explanation

Correct answer: 468

Here, \(S_4\) means the sum of the first four terms: \(3+15+75+375=468\). Therefore, 468 is correct. Note that 375 is the last term, not the sum; similarly, 475 is not obtained from the required addition. Exam tip: when only a few terms are given, direct addition is often the quickest way to verify the sum.

Related tags

Geometric ProgressionSequence And SeriesSum Of TermsClass 9 MathematicsFinite GpSequences And ProgressionsMathematicsClass 9 Mcq

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