# What is the sum of 1 to n?

Table of Contents

## What is the sum of 1 to n?

Also, the sum of first ‘n’ positive integers can be calculated as, Sum of first n positive integers = n(n + 1)/2, where n is the total number of integers. Let us see the applications of the sum of integers formula along with a few solved examples.

**What is the sum of Series formula?**

Formula for Sum of Arithmetic Sequence Formula

Sum of Arithmetic Sequence Formula | |
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When the Last Term is Given | S = n⁄2 (a + L) |

When the Last Term is Not Given | S = n⁄2 {2a + (n − 1) d} |

### What is the sum of first n terms of the AP a 3a 5a?

The given AP is a, 3a, 5a, The first term is a and the common difference is 2a. The sum of n terms of the given AP is Sn = n/2 (2a+(n−1)2a). The sum of n terms of AP a, 3a, 5a, is an2.

**How do you find the sum of 1+3+5+7+…+97+99?**

So to find the sum of 1+3+5+7+…+97+99, we need to determine how many odd integers we are summing. One way to do this is find the range of the numbers (i.e, take the smallest integer in the series and subtract it from the largest).

#### How do you find the sum of terms in an arithmetic sequence?

The sum to n terms of an Arithmetic sequence is given by: Sn = n 2 [2a + (n − 1)d] where a, is the 1st term, d the common difference and n, the number of terms to be summed. Here a = 1, d = 2 and n = 14

**What is the value of 1+3+5+7+9?**

Notice 1=1=1² , 1+3=4=2² , 1+3+5=9=3² , 1+3+5+7=16=4² , 1+3+5+7+9=25=5² …. Each sum of sequential odd integers is the square of the index (the count of how many odd integers you have summed).

## How do you find the sum of the harmonic series?

Each term of the harmonic series is greater than or equal to the corresponding term of the second series, and therefore the sum of the harmonic series must be greater than or equal to the sum of the second series.