In an AP `6^(th)` term is half the `4^(th)` term and the `3^(th)` term is 15. How many terms are needed to give a sum that is equal to 66.

Find an AP whose 4th term is 9 and the sum of its 6th and 13th terms is 40.

The 7^th term of an AP is 34 and the 15^th term is 74. Find the 40^th term.

The 29^(th) term of an A.P is twice its 19^(th) term. Its 9^(th) term is equal to

The 12^(th) term and 15^(th) term of an AP are 68 and 86 respectively. Find its 18^(th) term

If 10th term of an A.P is 15 and 15th term is 10, then 4th term is

The sum of the 4^(th) and 8^(th) terms of an AP is 24 and the sum of its 6^(th) term and 10^(th) term is 44. Find the first three terms of the AP.

If the 10^(th) term of an AP is 0 , then find the ratio of the 27^(th) term and the 15^(th) term of the AP.

Find the sum of the first ten terms of the A.P. whose 4th term is -15 and 9th term is -30