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Find the sum of natural numbers from (26) to (35).

Answer and explanation

Correct answer: 305

There are 10 numbers from 26 to 35. Using the sum formula for an arithmetic progression,

a = 26, d = 1, n = 10


\\(S_n = \frac{n}{2}[2a+(n-1)d]\) = \\(\frac{10}{2}[2(26)+9]\) = \\(5(61) = 305\). Therefore, 305 is the correct answer. A result such as 295 may arise from counting the terms incorrectly or using the wrong last term. Exam tip: For sums of consecutive integers, first determine the number of terms carefully.

Related tags

Arithmetic ProgressionNatural NumbersSum Of TermsSequences And ProgressionsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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