If \( z=(3+7 i)(a+i b) \) where \( a, b \in Z-\{0\} \), is purely imaginary, then the minimum va....
If \( z=(3+7 i)(a+i b) \) where \( a, b \in Z-\{0\} \), is purely imaginary, then the minimum value of \( |z|^{2} \) is
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