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Let there be an A.P. with first term ...

Let there be an A.P. with first term `' a '` , common difference `' d '` . If `a_n` denotes its `n t h` term and `S_n` the sum of first `n` terms, find `a` , if `a_n=28 ,\ \ S_n=144` and `n=9` .

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