Question

the nth form of an AP is ( 2n+1) then the sum of 10 terms is​

Answer 1

Given: the nth form of an AP is ( 2n+1)

To find : the sum of 10 terms

Solution:

nth term of an AP = 2n + 1

=> 1st term =   2(1) + 1 = 3

2nd term = 2(2) + 1 = 5

3rd term = 2(3) + 1 = 7

10th term = 2(10) + 1 = 21

Hence AP

= 1  , 3 , 5 , 7 ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,21

common difference = 3 - 1 = 2

Sum of 10 Terms  = (10/2) (1 + 21)

=  5 * 22

= 110

sum of 10 terms = 110

Learn more:

How to derive sum of n terms of an A.P? - Brainly.in

https://brainly.in/question/7849150

an ap consists of 45 terms. The sum of the three middle most terms ...

https://brainly.in/question/14625676