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Find the sum of the natural numbers from 301 to 350.

Answer and explanation

Correct answer: 16275

For a consecutive interval from a to b, use the difference of partial sums: sum(a to b) = S_b − Sₐ₋₁, where Sₖ = k(k + 1)/2. Here the required sum is S₃₅₀ − S₃₀₀. Calculate S₃₅₀ = 350 × 351 / 2 = 613? More directly, 175 × 351 = 61425. Also, S₃₀₀ = 300 × 301 / 2 = 150 × 301 = 45150. Therefore, the interval sum is 61425 − 45150 = 16275, so option B is correct. Subtracting S₃₀₀ is necessary because the range begins at 301. Using S₃₅₀ alone would include numbers 1 through 300 and give an incorrect result; the other options reflect nearby arithmetic errors.

Related tags

Sum Of Natural NumbersRange SumSequencesPartial SumsSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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