If the first term of an A.P. is 2 and common difference is 4, then the sum of its first 40 terms is-

If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 terms is (a) 3200 (b) 1600 (c) 200 (d) 2800

If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 terms is (a) 3200 (b) 1600 (c) 200 (d) 2800

If the sum of n terms of an A.P. be 3n^2-n and its common difference is 6, then its first term is

If the sum of first k terms of an A.P. is 3k^2-k and its common difference is 6. What is the first term ?

The first term of an A.P is 6 and the common difference is 5. Find the A.P and its general term.

The first term of an A.P. is 6 and the common difference is 5. Find the A.P. and its general term.

In an A.P. the difference between the last and the first terms is 632 and the commons difference is 4. Then the number of terms in the A.P. is

The first term of an A.P. is 5 and its common difference is -3 . Find the 11th term of an A.P.

The first and the last terms of an A.P are 17 and 9 . If common difference is -2 , then find the number of terms and their sum.