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Find the sum of natural numbers from (126) to (175).

Answer and explanation

Correct answer: 7525

There are \(175-126+1=50\) terms from 126 to 175. Using the arithmetic progression sum formula, \(S=\frac{n}{2}(a+l)\), we get \(S=\frac{50}{2}(126+175)=25\times301=7525\). Hence, option A is correct. An answer such as 7475 can result from incorrectly counting the terms or mishandling an endpoint. Exam tip: for an inclusive range, always add \(+1\) while finding the number of terms.

Related tags

Arithmetic ProgressionSum Of Natural NumbersConsecutive IntegersSeries SumClass 9 MathematicsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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