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Previous Year Question (PYQs)
3
Let f : R $ \to $ R be a function which satisfies f(x + y) = f(x) + f(y) $\forall $ x, y $ \in $ R. If f(1) = 2 and g(n) = $\sum\limits_{k = 1}^{\left( {n - 1} \right)} {f\left( k \right)} $, n $ \in $ N then the value of n, for which g(n) = 20, is
Solution
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