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 is the sum of all the terms of the A.P. and the common difference is given by (l^2-a^2)/(k-(l+a)) , then k= (a) S (b) 2S (c) 3S (d) none of these

The first and last term of an A.P. are a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by (l^2-a^2)/(k-(l+a)) , then k= (a) S (b) 2S (c) 3S (d) none of these

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 and last terms of an A.P. are a and l respectively. If S be the sum of the terms then show that the common difference is (l^(2) - a^(2))/(2S - (l+a)) .

The first and last terms of an AP are a and l respectively.If S be the sum of terms then show that the common difference is (l^(2)-a^(2))/(2S-(a+l))

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, second and middle terms of an A.P. are a, b, c, respectively. Then the sum of all terms of the A.P. is

If the first and last term of an A.P. are 18 and 82 respectively, then S_(25)=

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