Question

whay is the sum of first 25 odd natural numbers ​

Answer 1

625

1, 3, 5, 7, 9, . . . . , 49. Therefore, 625 is the sum of first 25 odd numbers.

Answer 2

Answer:625

To find the sum of first n odd numbers we can apply odd number theorem, it states that the sum of first n odd numbers is equal to the square of n.

∑(2i – 1) = n2 where i varies from 1 to n

let n = 10, therefore sum of first 10 odd numbers is

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100

if we apply odd number theorem:

sum of first 10 odd numbers = n * n = 10 * 10 = 100.

Below is the implementation of the above approach:Step-by-step explanation:

Using this theroem u can find the answer U will get 625