# Its a Function!

**Algebra**Level pending

*x* , *y* \( \epsilon\) \( \mathbb R\) and \( f(1) \) = **a** , ( **a** \( \neq \) 1 ). Then what is the value of the expression \[ [(a-1) . \displaystyle\sum_{i=1}^n f(i)] + a \] .

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