Question

find the sum first 25 natural no.?

Answer 1

$= \frac{n}{2} (a + tn) \\ = \frac{25}{2} (1 + 25) \\ = 23 \times 26 \\ = 598$

Answer 2

hii friend. ..
here is your answer. ....

n/2 (a+tn)

here n=25, a=1

25/2 (1+25)

12.5 (26)

=325

it is your answer★★★★

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