The `n^(th)` term of an arithmetic sequence is `a_n`=5-6n.Find its sum of n terms?

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

Algebraic form of an n^(th) term of an arithmetic sequence is 8n-4. Prove that the sum of the n consecutive terms of this sequence is a perfect square.

The algebraic form of an arithmetic sequence is 6n+5. Find the sum of first 20 terms of this 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 first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171 a) What is the sum of its 10^(th) to 18^(th) terms? b) What is its 5^(th) term? c) Find its 14^(th) term. d). Find the sum of 5^(th) to 14^(th) terms.

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 algebraic form of an arithmetic sequence is 8n+7 . Find the sum of first 30 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.

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?