Question

What is the sum of first 25 odd natural number ?

Answer 1

Step-by-step explanation:

Question asks

(1+3+5+7+......25 terms)

treating it as an ap.

here a=1

n=25

d=2

$s = \frac{n}{2} (2a + (n - 1)d) \\ s = \frac{25}{2} (2 + (24 \times 2)) \\ s = 25(1 + 24) = 625$