Questions

The first and last terms of an arithmetic series are -24 and 72 respectively. If the sum of all terms of the series is 600, find the number of terms and the common difference of the series.

The sum of the first 7 terms of an arithmetic series is 14 and the sum of the first 11 terms is 66. Find the sum of the first 25 terms.

The sum of the first 9 terms of an arithmetic series is 72 and the sum of the first 17 terms is 289. Find the sum of the first 25 terms.

Fourteenth term of an arithmetic series is 2 and the sum of its first ten terms is -150. Find the sum of the first twenty-five terms of the series.

In an Arithmetic sequence, the sixth term is equal to three times the fourth term and the sum of the first three terms is -12. Find the sum of the first ten terms.

Find the sum of the first 29 terms of an AS if its $\rm 15^{th}$ term is 2.

If the $\rm 7^{th}$ term of an A.S. is 70, find the sum of the first 13 terms.

If the $\rm 6^{th}$ term of an A.S. is 64, find the sum of the first 11 terms.

If $\rm 9^{th}$ and $\rm 20^{th}$ terms of an A.S. are 18 and 40 respectively, find the sum of the first 29 terms.

The sum of $\rm 4^{th}$ and $\rm 8^{th}$ terms of an A.S. is 70, and the sum of $\rm 6^{th}$ and $\rm 10^{th}$ term is 94. Find sum of first 20 terms.