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Write the expression an-ak for the A.P. ...

Write the expression `a_n-a_k` for the `A.P. a, a+ d, a + 2d..........`, Hence, find the common difference of the `A.P`. for which `(i) 11`th term is `5` and `13th` term is `79 (ii) a_10- a_5 =200 (ii) 20`th term is `10` more than the `18`th term.

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