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How much will be the sum of natural numbers from (71) to (80)?

Answer and explanation

Correct answer: 755

There are 10 numbers from 71 to 80, inclusive. Using the sum formula for an arithmetic sequence:

\(\frac{10}{2}(71+80)=5\times151=755\).

Therefore, the correct answer is 755. A choice such as 745 may result from an error in counting the number of terms or finding the average. Exam tip: the number of terms from one endpoint to another is \(\text{last term}-\text{first term}+1\).

Related tags

Arithmetic ProgressionConsecutive IntegersSum Of Natural NumbersSequence FormulasClass 9 MathematicsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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