Created By : Abhinandan Kumar
Reviewed By : Rajashekhar Valipishetty
Last Updated : Mar 21, 2023


Make use of our handy arithmetic sequence calculator and Find the Sum of n terms of Arithmetic Sequence a = 5, n=81, and d=3. After clicking on the calculate button you will get the desired output i.e. 10125.0 for the given inputs in a matter of seconds.

First term [a]:
common difference[d]:
Total terms[n]:

Sum of Arithmetic Sequence a = 5, n=81, and d=3 is 10125.0

Steps to find sum of n terms of arithmetic sequence:

sum of n terms of arithmetic sequence formula:-

Sn = `n/2 (2a+(n-1)d)`

where:

  • sn is the sum of n terms
  • a is first term
  • n is total number of terms
  • d is common difference

Input values are:-

a = 5

n = 81

d = 3

Put values into formula

S81 = `n/2 (2a+(n−1)d)`

S81 = `81/2 * ( 2*5 + ( 81 - 1)*3 )`

S81 = 10125.0

Here is the detailed procedure to find the sum of first n terms of Arithmetic Sequence a = 5, n=81, and d=3. Let’s jump into the process and learn the calculation along with the output of sum of n terms of AP:

  • At first, we need to figure out the given values to find the sum of first n terms of AP ie., a = 5, n=81, and d=3.

  • Now, take the sum of n terms of Arithmetic progression formula ie., S = n/2 * [2a₁ + (n-1)d] and substitute the input values.

  • After that, we get S = 81/2 * [2(5) + (81-1)3].

  • Now, simply the above expression to get the sum of first n terms of Arithmetic sequence for a = 5, n=81, and d=3 is S5 = 10125.0

Example for Finding Sum of n terms of Arithmetic Sequence

FAQs on How to find Sum of n terms of A.P for a = 5, n=81, and d=3

1. Where Can I Find the Sum of n terms of Arithmetic Sequence a = 5, n=81, and d=3?

You can Find the Sum of n terms of Arithmetic Sequence a = 5, n=81, and d=3 from our online tools ie., arithmetic sequence calculator.

2. Do I Get the Result for the Sum of n terms of A.P for a = 5, n=81, and d=3 easily using a calculator? 

Yes, you will get the Result for the Sum of n terms of A.P for a = 5, n=81, and d=3 easily using our handy arithmetic calculator tool. The output is S5 = 10125.0

3. What is the formula for finding the sum of n terms of arithmetic progression? 

The formula for determining the sum of n terms of arithmetic progression is S = n/2 * [2a₁ + (n-1)d].