Question

The algebraic form of an arithmetic sequence is 6n-1 Find the sum of its first 25 terms

Answer 1

Step-by-step explanation:

Suppose a sequence of numbers is arithmetic (that is, it increases or decreases by a constant amount each term), and you want to find the sum of the first n terms.

Denote this partial sum by Sn . Then

Sn=n(a1 + an)2 ,

where n is the number of terms, a1 is the first term and an is the last term.

The sum of the first n terms of an arithmetic sequence is called an arithmetic series .