सभी \( x, y \in \mathrm{N} \) के लिए \( f(x+y)=f(x) \cdot f(y) \) को संतुष्ट करता हुआ \( f \) एक...

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सभी \( x, y \in \mathrm{N} \) के लिए \( f(x+y)=f(x) \cdot f(y) \) को संतुष्ट करता हुआ \( f \) एक ऐसा फलन है कि \( f(1)=3 \) एवं \( \sum_{x=1}^{n} f(x)=120 \) तो \( n \) का मान ज्ञात कीजिए।
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