Question

write all the odd Integers between 60 to 75​

Answer 1

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.