If m times the (m)th term of an A.P. is equal to n times its (n)th term, show that the (m+n)th term

If m times the (m)th term of an A.P. is equal to n times its (n)th term, show that the (m+n)th term

if the m times the mth term of an ap is equal to n times, if m times of mth term equal to nth times nth term, if m times the mth term is equal to, if m times the mth term equals n times the nth term, m times the nth term is equal to, if mth term of an ap is 1/n and nth term is 1/m, if the mth term of an a.p is 1/n and nth term is 1/m, if mth term of an a.p.is 1/n and nth term is 1/m, show that the sum of mn terms is 1/2(mn+1), if the m times the mth term, prove that mnth term of ap series is 1