Question

what is the sum of odd numbers from 11 to 65​

Answer 1

Answer:

875

Step-by-step explanation:

here first term a =11

last term l=59

common difference d=2

an=a+(n-1)d

59=11+(n-1)2

59-11= (n-1)2

48/2=(n-1)

24=(n-1)

n=25

an =n/2(a+l)

25/2(11+59)

25/2×70

25×70/2

1750/2

875

hope this helps you