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Let Tr be the rth term of an A.P. whose ...

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/n` and `T_n=1/m`, then a-d equals :

A

0

B

1

C

`1/(mn)`

D

`1/m+1/n`.

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