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After removing the first (10) odd natural numbers from the first (18) odd natural numbers, what is the sum of the remaining (8) numbers?

Answer and explanation

Correct answer: 224

The sum of the first n odd natural numbers is \(n^2\). Therefore, the sum of the first 18 odd numbers is \(18^2=324\), and the sum of the first 10 odd numbers is \(10^2=100\). Hence, the sum of the remaining 8 numbers is \(324-100=224\). A value such as 234 may result from an error in subtraction. Exam tip: when an initial set of terms is removed, subtract its sum from the total sum.

Related tags

Arithmetic ProgressionOdd Natural NumbersSum Of TermsPartial SumsClass 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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