Welcome to my article **How to solve 1+2+3+4+5 to 20 formula calculator**. This question is taken from the simplification lesson.

The solution of this question has been explained in a very simple way by a well-known teacher by doing addition, subtraction, and fractions.

For complete information on how to solve this question **How to solve 1+2+3+4+5 to 20 formula calculator**, read and understand it carefully till the end.

Let us know how to solve this question **How to solve 1+2+3+4+5 to 20 formula calculator**.

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## How to solve 1+2+3+4+5 to 20 formula calculator

**Let’s solve this question by writing it like this**,

This has been solved by arithmetic progression

where a= first term

n = no. of terms

d=common difference

Therefore

sum of n terms = Sn

and

a = 1

d = 1

n = 20

**Formula **

**Sn = \displaystyle \frac{\mathbf{n}}{\mathbf{2}}\times \text{ }[\text{ }\mathbf{2}\text{ }\mathbf{a}+\left( {\mathbf{n}-\mathbf{1}} \right)\mathbf{d}]**

**Substituting the values of a , d , and n in this formula,**

** \displaystyle Sn=210 [Answer**]

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