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Find the sum of natural numbers from (151) to (225).

Answer and explanation

Correct answer: 14100

There are \(225-151+1=75\) terms from 151 to 225. Their average is \(\frac{151+225}{2}=188\). Therefore, the sum is \(75\times188=14100\). A value such as 14050 can result from counting the terms or the last term incorrectly. Exam tip: for consecutive numbers, use \(\text{number of terms}\times\text{average}\) for a quick calculation.

Related tags

Sequences And ProgressionsNatural NumbersSum Of Consecutive IntegersArithmetic ProgressionClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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