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Let T(r ) be the rth term of an A.P. who...

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,mcancel(=)n, T_(n) = ( 1)/( n ) ` and `T_(n) = ( 1)/( m)` , then a -d equals `:`

A

`(1)/(m)+(1)/(n)`

B

1

C

(1)/(m n)`

D

0

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The correct Answer is:
D
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