" (26.) The first and the last terms of an A.P.are "7" and "49" respectively.If sum of all its terms "

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 AP are 7 and 49 respectively.If sum of all its terms is 420, find its common difference.

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 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 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 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 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