The first and the last terms of an AP are 7 and 49 respectively. If sum of all its terms is 420, find its common difference.

The first and the last term of an AP are 7 and 49 respectively. If the sum of all its terms is 420, find the common difference.

The first and the last terms of an A.P. are 5 and 45 respectively. If the sum of all its terms is 400, find its common difference.

The first and the last terms of an A.P.are 5 and 45 respectively.If the sum of all its terms is 400, find its common difference.

If the first and the last terms of an A.P. are -4 and 146 respectively and the sum of this A.P. is 7171 then its common difference is

The first and last term of an A.P. are a and l respectively. If S be the sum of all the terms of the A.P., them the common difference is

The first and last term of an A.P. are a and l respectively. If S be the sum of all the terms of the A.P., them the common difference is

The first and last elements of an A.P are a and l respectively. If S is the sum of all terms of the A.P, then the common difference is

The first term and the last term of an A.P. are 2 and 29, respectively. If the sum of the series is 155, find the number of terms and common difference.