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If in an A.P. the sum of m terms is equ...

If in an A.P. the sum of `m` terms is equal of `n` and the sum of `n` terms is equal to `m ,` then prove that the sum of `-(m+n)` terms is `(m+n)`.

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Sm =n
`m/2 (2a+(m−1)d)=n`
2am+m(m−1)d=2n…(i)
and Sn =m
...
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