The sum of first 10 terms and 20 terms of an AP are 120 and 440 respectively.
What is its first term ?

The sum of first 10 terms and 20 terms of an AP are 120 and 440 respectively. What is the common difference?

If the 5th and 12th terms of an A.P. are 30 and 65 respectively, what is the sum of first 20 terms?

The 5th and 11th terms of an A.P. are 41 and 20 respectively. What is its first term ? Find the sum of its first eleven terms.

If the 5th and 12th terms of an A.P. are 30 and 65 respectively, what is the sum of the first 20 terms ?

The sum of first 5 terms and first 15 terms of an A.P. are equal. Find the sum of its first 20 terms.

The sum of first 5 terms and first 15 terms of an A.P. are equal. Find the sum of its first 20 terms.

In an A.P, the 5th and 12th terms are 30 and 65 respectively. What is the sum of the first 20 terms?

If the second term and the fourth terms of an A.P. are 12 and 20 respectively, then find the sum of first 25 terms: