Question

1+2+3+4+.......... sum of first 25 ​

Answer 1

Answer:

Solved by Arithmetic Progression

Formula = $\frac{n}{2}$ × $(highest+lowest$ $term)$

= $\frac{25}{2}$ × $(1+25)$

= $\frac{25}{2}$ × $26$

= $25$ × $13$

= $325$

Hence the sum of the first 25 natural numbers is 325.

NOTE: We can use this formula only when the difference between the terms is same.

Hope it helps

Answer 2

.°. Sum of the first 25 terms is 325.