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If the sum of the first \(n\) terms of an AP is zero and \(n\) is odd, which of the following statements must be true?

Answer and explanation

Correct answer: The middle term is zero.

For an AP with an odd number of terms, let the middle term be \(m\). The sum of the first \(n\) terms is \(S_n=n m\). Since \(n\neq0\) and \(S_n=0\), \(m=0\). The common difference need not be zero. Exam tip: for odd terms, relate the sum directly to the middle term.

Related tags

Arithmetic ProgressionSum Of ApOdd Number Of TermsMiddle TermClass 10 MathematicsFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)

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