For an A.P., show that `t_(m) + t_(2n + m) = 2t_( m + n)`

For an A.P. show that t _(m) + t _(2n + m) = 2 t _(m +n)

For an A.P.show that t_(m+n)+t_(m-n)=2t_(m)

For an A.P., show that (m +n)th term + (m-n) term =2 xx m th term

In an A.P., prove that : T_(m+n) + T_(m-n) = 2*T_(m)

In an A.P., prove that : T_(m+n) + T_(m-n) = 2*T_(m)

For an A.P., show that T_p+T_(p+2q)=2T_(p+q) .

If the sequence a_n is A.P., show that a_(m+n)+a_(m-n)=2a_mdot\

Let T_(r) be the rth term of an A.P, for r = 1,2 …. If for some positive integers m and n, we have T_(m)=1/n and T_n= 1 /m , the T_(mn) =

Let {t_(n)} is an A.P If t_(1) = 20 , t_(p) = q , t_(q) = p , find the value of m such that sum of the first m terms of the A.P is zero .