Question

Addition of all odd no. Between 11 to 60

Answer 1

if the quwstion is 11 to 60 then
a= 11
d= 2

an= n/2{ 2a+(n-1)d}
an= 25/2{22+(24×2)}
an= 12.5{22+48}
=12.5×70
=875
if there is btw 11 to 6
then take a=13

Answer 2

Hey mate here is your answer
The sum is 11 + 13 + 15 + …………. + 59

This can be solved using Arithmetic progression:

First Term, a = 11

Last Term, l = 59

Common difference, d = 2

Number of terms, n = (l-a)/d + 1

= (59 - 11)/2 + 1

= 48/2 + 1

= 24 + 1

= 25

So, n= 25

So, Sum of this Arithmetic Progression = n/2(a+l)

= 25/2(11+59)

= 25/2 X 70

= (25X70)/2

= 1750/2

= 875

Hence, the sum of odd numbers from 11 to 60 is 875.


Hope it helps you mate and if the answer satisfies you then plz mark as brainliest