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The sum of the first term and the (60)th term of an AP is (300). Find the sum from the (21)st term to the (40)th term.

Answer and explanation

Correct answer: (3000)

(a_{21}+a_{40}=a_1+a_{60}=300), so the sum of (20) terms is (3000). Sums of symmetric terms are equal in an AP.

Related tags

Symmetric TermsRange SumApFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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