Question

sum of first odd natural
number​

Answer 1

odd numbers are 1,3,5,7,9 = 25

25/5 =5 answer

Answer 2

Answer:

sum of first odd natural numbers = n²

first odd number is 1 = a

common difference between odd numbers is 2

we know

sn = n/2(2a +(n-1)d)

sn = n/2 (2+(n-1)(2)) taking 2 as commin

sn = 2.n/2 (1+n-1)

sn = n(n)

sn = n²

for odd natural numbers