`n^(th)` term of an AP from the end

Let a_1,a_2,a_3 ......, a_n are in A.P. such that a_n = 100 , a_40-a_39=3/5 then 15^(th) term of A.P. from end is

If the n^(th) term of an A.P is 2n-1 then sum to n terms of that A.P. is ........... .

If the m^(th) term and the n^(th) term of an A.P. are respectively (1)/(n)and(1)/(m) , then the (mn)^(th) term of the A.P. is

If an A.P. consists of n terms with first term a and n^(th) term l then show that the sum of the m^(th) term from the beginning and the m^(th) term from the end is (a+l) .

IF a,a+d,a+2d…….l is an A.P., then find the n^(th) terms from the end l.

The m^(th) term of an A.P. is n and n^(th) term is m its p^(th) term is

IF m^(th) term of an A.P. is n and n^(th) term is m, then find p^(th) term?

The m^(th) term of an A.P. is n and n^(th) term is m its p^(th) term is

Show that the sum of (m + n)^(th) and (m – n)^(th) terms of an A.P. is equal to twice the m^(th) term.