The \( m^{\text {th }} \) term of an AP is \( a \) and its \( n^{\text {th }} \) term is \( b \)....

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The \( m^{\text {th }} \) term of an AP is \( a \) and its \( n^{\text {th }} \) term is \( b \), and \( m \neq n \). Then the sum of the first \( (m+n) \) terms of the
\( \mathrm{P} \)
\( A P \) is
W
(1) \( \frac{m+n}{2}\left[a+b+\frac{a-b}{m-n}\right] \)
(2) \( \frac{m+n}{2}\left[(a+b)-\frac{a-b}{m-n}\right] \)
(3) \( \frac{m+n}{2}\left[(a+b)+\frac{a+b}{m+n}\right] \)
(4) \( \frac{m+n}{2}\left[(a-b)-\frac{a-b}{m+n}\right] \)



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