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After removing the first (14) odd natural numbers from the first (26) odd natural numbers, what will be the sum of the remaining numbers?

Answer and explanation

Correct answer: 480

The sum of the first n odd natural numbers is n². Therefore, the sum of the first 26 odd numbers is 26² and that of the first 14 odd numbers is 14². Remaining sum = 26² − 14² = 676 − 196 = 480. A value such as 468 may result from using an incorrect average for the 12 remaining terms. Exam tip: Recall directly that the sum of the first n consecutive odd numbers is n².

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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