Step 1 :

Partial sum of an arithmetic sequence is .

Sum of the n  terms of an arithmetic sequence is .

Where,

n is number terms.

is the initial term and

is the initial term.

Step 2 :

 Partial sum of an arithmetic sequence is .

Initial term of the sequence is .

Final term of an arithmetic sequence is .

Where,

is the Initial term.

is the common difference.

Common difference : .

Final term of an arithmetic sequence is.

Step 3 :

 Sum of the n  terms of an arithmetic sequence is .

Substitute the values of in above formula. \ \

Thus, the sum is 1765.