Write four arithmetic sequences with 100 as the sum of the first four terms.

Write three arithmetic sequences with 30 as the sum of the first five terms.

The first term of an arithmetic sequence is 1 and the sum of the first four terms is 100 . Find the first four 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 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?

What is sum of the first.20 natural numbers? ii) The algebraic form of an arithmetic sequence is 6n+5. Find the sum of the first 20 terms of this sequence.

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 the first and 21^(th) terms of an arithmetic sequence is 140.Calculate the sum of first 11 terms of this sequence,if the first term is 10.

Algebraic form of an arithmetic sequence is 6n+3 a) Find the sum of first 20 terms of the sequence: b) Write the algebraic expression of the sum.

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.

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?