If the first, fifth and last terms of an `A.P.` is `l`, `m`, `p`, respectively, and sum of the `A.P.` is `((l+p)(4p+m-5l))/(k(m-l))` then `k` is

If the first, second and the last terms of an A.P. are a,b,c respectively, then the sum of the A.P. is

If the first, second and the last terms of an A.P. are a,b,c respectively, then the sum of the A.P. is

If pth, qth and rth terms of an A.P. are l, m, n respectively, show that (q-r)l+(r-p)m+(p-q)n=0

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 fifth and nineth term of an A.P. are 7 and 11 respectively. Determine the A.P. which term of the A.P. is 2 ?

If p^(th), q^(th) and r^(th) terms of an A. P. are l, m, n, respectively, show that (q - r )l + (r -p)m +(p - q)n =0

If the pth, qth and rth terms of a G.P. are , l,m,n respectively , then l^(q-r)m^(r-p)n^(p-q) is :

If a and l are first and last terms of an A.P. then the number of terms is ….

The first term, common difference and last term of an A.P. are 12,6 and 252 respectively, Find the sum of all terms of this A.P.

The first and last terms of an A.P. having a finite number of terms are respectively (-2) and 124 and the sum of the A.P. is 6161. Find the number of terms in the A.P. and also its common difference.