How many terms are there in A.P. whose first and fifth terms are -14 and 2 respectively and the sum of terms is 40 ?

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

If the first and fifth term of AP are 12 and 60. Find the 15th term of this AP.

Find the sum of first 51 terms of an AP whose second and third terms are 14 and 18 respectively.

The sum of some terms of G.P. is 315 whose first term and the common ratio are 5 and 2, respectively. Find the last term and the number of terms.

How many terms are there in A.P. 5, 11, 17, ....299 ? Also find 16th term.

How many terms are there in the A.P. -7,-4,-1, 2, ...., 101 ?

If the 3rd and 9^(th) terms of an A.P. are 4 and - 8 respectively, which term of this A.P. is zero.

The sum of n terms of an A.P. whose first term is 5 and common difference is 36 is equal to the sum of 2n terms of another A.P. whose first term is 36 and common difference is 5. Find n.