Question

If a1=4 and the common difference is 3 then what is the sum of the first twenty terms of the sequence

Answer 1

Answer:

Step-by-step explanation:

Answer 2

650

Step-by-step explanation:

First term = $a_1=4$

Common difference = $d=3$

Formula of first n terms = $S_n=\frac{n}{2}(2 a_1+(n-1)d)$

$S_n$ is the sum of first n terms

n is the no. of terms

d is the common difference

We are supposed to find The sum of the first twenty terms of the sequence.

Substitute the values:

$S_{20}=\frac{20}{2}(2(4)+(20-1)3)$

$S_{20}=650$

Hence the sum of the first twenty terms of the sequence is 650

#Learn More :

Arithmetic Progression

1)https://brainly.in/question/5564454 , Answered by Abhi178