Let Tr, be the rth term of an A. P. for r = 1, 2, 3, _____ If for some positive integers m and n, we have \(T_m=\dfrac{1}{n}\:\text{and}\:T_n=\dfrac{1}{m},\) then Tmn equals:
1
1
2
\(\left(\dfrac{1}{m}\right)+\left(\dfrac{1}{n}\right)\)
3
\(\dfrac{1}{mn}\)
4
More than one of the above
5
None of the above