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The first term and common difference of an A.P. are a and d respectively. If mth and nth terms of this A.P. are `1/m and 1/n` respectively, then the value of `(a-d) ` is-

A

`(1)/(mn)`

B

0

C

1

D

`(m+n)/(mn)`

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The correct Answer is:
D
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