If $\frac { 1 ^ { 3 } + 2 ^ { 3 } + 3 ^ { 3 } \ldots\ldots \text { upto } n \text { terms } } { 1 \cdot 3 + 2 \cdot 5 + 3 \cdot 7 + \ldots.. \text { upto } n \text { terms } } = \frac { 9 } { 5 }$ then the value of $n$ is