Let $${{T_r}}$$ be the rth term of an A.P. whose first term is a and common difference is d. If for some positive integers m, n, $$m \ne n,\,\,{T_m} = {1 \over n}\,\,and\,{T_n} = {1 \over m},\,$$ then a - d equals
JEE · Math · previous-year question
- A.$${1 \over m} + {1 \over n}$$
- B.1
- C.$${1 \over {m\,n}}$$
- D.0
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