Question

If a and l be the first and last term of an ap and S be the sum of its all terms then its common difference is

Answer 1

Let the common difference and number of terms of A.P. be d and n respectively.

∴ Last term of A.P. = n ^th of the A.P., a_n

⇒ a_n  = l(Given)

Sum of n terms of A.P. = S (Given)