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The sum of first n terms of an arithmeti...

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

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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 n terms of an arithmetic sequence is n^2+2n Prove that the sum of continuous terms starting from the first of the sequence 3,5,7,..... added to 1 gives a perfect square.

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?

The sum of first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171. What is its 5^(th) term?

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. Find its 14^(th) term.

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.

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

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