Question

Sum of all natural numbers from 10 to 30?

Answer 1

hii mate....ur ans is 420
hope it helps

Answer 2

The natural numbers from 10 to 30 are 10, 11, 12............30
These numbers are in the form of an arithmetic progression with first term 10, common difference 1 and last term 30.
Number of terms here = 21
Sum of terms = number of terms/2 (first term + last term)
                       = 21/2 (10 + 30)
                       = 21*40/2
                       = 21*20
                       = 420
Therefore the sum of natural numbers from 10 to 30 is 420

Hope this helps you.