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Obtain the sum of the first 56 terms of ...

Obtain the sum of the first 56 terms of an A.P. Whose 18th and 39th terms are 52 and 148 respectively.
(1) Usint `t_(18)` and `t_(39)` find two simultaneous equations in variables a and d.
(2) Using these equations, find `S_(56)`

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