[325] Find the sum of first 25 natural numbers.

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Aptitude

TNPSC G4

10th CBSE Maths

Find the sum of first 25 natural numbers.

325

225

300

425

Explanation:

Sum of first n natural numbers = $\dfrac{n × (n + 1)}{2}$
Sum of first 25 natural numbers = $\dfrac{25 × (25 + 1)}{2}$
= $\dfrac{25 × 26}{2}$
= 25 × 13
= 325

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