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What is the sum of the first (6) terms of (96,88,80,\ldots)?

Answer and explanation

Correct answer: 456

This is an arithmetic progression with first term 96 and common difference \(-8\). Its first 6 terms are 96, 88, 80, 72, 64, and 56, whose sum is 456. A value such as 464 results from an error while adding the decreasing terms. Exam tip: Use \(S_n=\frac{n}{2}[2a+(n-1)d]\) to find the sum of an arithmetic progression quickly.

Related tags

Arithmetic ProgressionSequenceSum Of TermsCommon DifferenceClass 9 MathematicsSequencesSequences And ProgressionsMathematics

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