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If the m^(t h) term of an A.P. is 1/n a ...

If the `m^(t h)` term of an A.P. is `1/n a n d\ t h e\ n^(t h)t e r m\ i s1/m ,\ ` show that the sumof `m n` terms is `1/2(m n+1)` where `m!=ndot`

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