. What is the sum of all terms in the first 30 rows ?

Find the sum of all the numbers in the first ten lines.

If the sum of the first 100 terms of an AP is -1 and the sum of even terms lying in first 100 terms is 1, then which of the following is not true?

What is the sum of first n terms of an A.P. whose first term is 'a' and common difference is 'd'?

Arithmetic sequence is 1/7,2/7,3/7… What is the sum of the first 7 terms of this 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 n terms of an arithmetic sequence is n^2+2n What is the sum of first 20 terms of this sequence?

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.

In an A.P., the first term is 3 and the last term is 17. The sum of all the terms in the sequence is 70. Then the number of terms in the arithmetic sequence is

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.