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The sum of the first (6) terms of an arithmetic progression is (126). If the average of the first (6) terms is asked, what will it be?

Answer and explanation

Correct answer: 21

The formula for average is \(\text{average}=\frac{\text{sum of terms}}{\text{number of terms}}\). Hence, \(\frac{126}{6}=21\), so 21 is correct. Values such as 20 or 22 result from not dividing the total sum correctly by 6. Exam tip: for an average question, divide the total sum by the number of terms first.

Related tags

Arithmetic ProgressionAverageSum Of TermsClass 10 MathematicsFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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