The least number among $\frac { 4 }{ 9 } ,\sqrt { \frac { 9 }{ 49 } } ,0.45\quad and\quad { (0.8) }^{ 2 }$ is
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The least number among $\frac { 4 }{ 9 } ,\sqrt { \frac { 9 }{ 49 } } ,0.45\quad and\quad { (0.8) }^{ 2 }$ is