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In an A.P., S(m) = n and S(n) = m also ...

In an A.P., `S_(m) = n and S_(n) = m ` also `m gt n ` ,find the sum of first `(m-n)` terms .

A

`((m-n)(m+2n))/m`

B

`((m+n)(2m+n))/m`

C

`((m-n)(m+2n))/n`

D

`((m-n)(2m+n))/n`

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