Sum of the first 4 terms of an arithmetic sequence is 72. Sum of the first 9 terms is also 72. Write the sequence.

Sum of the first 4 terms of an arithmetic sequence is 72. Sum of the first 9 terms is also 72. What is the 5th term of the sequence?

Sum of the first 4 terms of an arithmetic sequence is 72. Sum of the first 9 terms is also 72. Find the sum of the first five terms.

The sum of first n terms of an arithmetic sequence is n^2+2n What is the first term?

Sum of first n terms of an arithmetic sequence is 8n^2 +5n. Find the sum of first 20 terms.

The sum of the first five terms of an arithmetic sequence is 150 and the'sum of the first ten terms is 550 . i) What is the third term of the sequence? ii) What is the eighth term? iii) What are the first three terms of the sequence?

Sum of the first 15 terms of an arithmetic sequençe is 495 and sum of first 25 terms is 1325 . i) What is the common difference of this sequence? ii) What is the first term? iii) What is the sum of first n terms of this sequence?

The sum of first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171. What is the sum of its 10^(th) to 18^(th) terms?

Sum of the first five terms of an arithmetic sequence is 45. What is the third term? Write the first two terms. Write another arithmetic sequence having the sum of the first five terms as 45.

The sum of first n terms of an arithmetic sequence is n^2+2n What is the sum of first 20 terms of this sequence?

The sum of first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171. Find the sum of 5^(th) to 14^(th) terms.