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The sum of the first (18) terms of an arithmetic progression is (1170). What will be the average of these terms?

Answer and explanation

Correct answer: 65

The formula for the average is \(\text{Average}=\frac{\text{sum of all terms}}{\text{number of terms}}\). Therefore, \(\frac{1170}{18}=65\). Hence, 65 is the correct answer. Option 64 is incorrect because \(18\times64=1152\), not the given sum of 1170. Exam tip: For an average question, divide the total sum by the number of terms.

Related tags

Arithmetic ProgressionAverageSum Of TermsClass 10 MathematicsApFinding 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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